diff --git a/packages/keychain/src/components/connect/create/ChooseSignupMethodForm.tsx b/packages/keychain/src/components/connect/create/ChooseSignupMethodForm.tsx
index 7d4905420..60100e0f1 100644
--- a/packages/keychain/src/components/connect/create/ChooseSignupMethodForm.tsx
+++ b/packages/keychain/src/components/connect/create/ChooseSignupMethodForm.tsx
@@ -10,6 +10,7 @@ interface ChooseSignupMethodProps {
   isLoading: boolean;
   validation: ReturnType<typeof useUsernameValidation>;
   onSubmit: (authenticationMode?: AuthOption, password?: string) => void;
+  onStorageAccessRequest: () => Promise<void>;
   authOptions: AuthOption[];
   isOpen?: boolean;
 }
@@ -18,6 +19,7 @@ export function ChooseSignupMethodForm({
   isLoading,
   validation,
   onSubmit,
+  onStorageAccessRequest,
   authOptions,
   isOpen = true,
 }: ChooseSignupMethodProps) {
@@ -123,7 +125,10 @@ export function ChooseSignupMethodForm({
               setSelectedAuth(option);
             } else {
               setSelectedAuth(option);
-              onSubmit(option);
+              void (async () => {
+                await onStorageAccessRequest();
+                onSubmit(option);
+              })();
             }
           }
           break;
@@ -134,7 +139,15 @@ export function ChooseSignupMethodForm({
           break;
       }
     },
-    [isOpen, showPasswordInput, isLoading, options, highlightedIndex, onSubmit],
+    [
+      isOpen,
+      showPasswordInput,
+      isLoading,
+      options,
+      highlightedIndex,
+      onSubmit,
+      onStorageAccessRequest,
+    ],
   );
 
   useEffect(() => {
@@ -168,12 +181,18 @@ export function ChooseSignupMethodForm({
       setSelectedAuth(option);
     } else {
       setSelectedAuth(option);
-      onSubmit(option);
+      void (async () => {
+        await onStorageAccessRequest();
+        onSubmit(option);
+      })();
     }
   };
 
   const handlePasswordSubmit = (password: string) => {
-    onSubmit("password", password);
+    void (async () => {
+      await onStorageAccessRequest();
+      onSubmit("password", password);
+    })();
   };
 
   const handlePasswordCancel = () => {
diff --git a/packages/keychain/src/components/connect/create/CreateController.stories.tsx b/packages/keychain/src/components/connect/create/CreateController.stories.tsx
index 29b295c4f..091a9aae7 100644
--- a/packages/keychain/src/components/connect/create/CreateController.stories.tsx
+++ b/packages/keychain/src/components/connect/create/CreateController.stories.tsx
@@ -32,6 +32,7 @@ export const Default: Story = {
     onUsernameChange: () => {},
     onUsernameFocus: () => {},
     onUsernameClear: () => {},
+    onStorageAccessRequest: async () => {},
     setChangeWallet: () => {},
     onSubmit: () => {},
   },
@@ -59,6 +60,7 @@ export const WithLightMode: Story = {
     onUsernameChange: () => {},
     onUsernameFocus: () => {},
     onUsernameClear: () => {},
+    onStorageAccessRequest: async () => {},
     setChangeWallet: () => {},
     onSubmit: () => {},
   },
@@ -85,6 +87,7 @@ export const WithTheme: Story = {
     onUsernameChange: () => {},
     onUsernameFocus: () => {},
     onUsernameClear: () => {},
+    onStorageAccessRequest: async () => {},
     setChangeWallet: () => {},
     onSubmit: () => {},
   },
@@ -110,6 +113,7 @@ export const WithTimeoutError: Story = {
     onUsernameChange: () => {},
     onUsernameFocus: () => {},
     onUsernameClear: () => {},
+    onStorageAccessRequest: async () => {},
     setChangeWallet: () => {},
     onSubmit: () => {},
   },
@@ -134,6 +138,7 @@ export const WithValidationError: Story = {
     onUsernameChange: () => {},
     onUsernameFocus: () => {},
     onUsernameClear: () => {},
+    onStorageAccessRequest: async () => {},
     setChangeWallet: () => {},
     onSubmit: () => {},
   },
@@ -159,6 +164,7 @@ export const WithGenericError: Story = {
     onUsernameChange: () => {},
     onUsernameFocus: () => {},
     onUsernameClear: () => {},
+    onStorageAccessRequest: async () => {},
     setChangeWallet: () => {},
     onSubmit: () => {},
   },
diff --git a/packages/keychain/src/components/connect/create/CreateController.test.tsx b/packages/keychain/src/components/connect/create/CreateController.test.tsx
index ec80bfa25..625a78a9c 100644
--- a/packages/keychain/src/components/connect/create/CreateController.test.tsx
+++ b/packages/keychain/src/components/connect/create/CreateController.test.tsx
@@ -10,6 +10,8 @@ const mockUseCreateController = vi.fn();
 const mockUseUsernameValidation = vi.fn();
 const mockUseControllerTheme = vi.fn();
 const mockUseWallets = vi.fn().mockReturnValue({ wallets: [] });
+const mockRequestStorageAccess = vi.fn().mockResolvedValue(true);
+const mockIsIframe = vi.fn();
 
 // Mock the ResizeObserver
 const ResizeObserverMock = vi.fn(() => ({
@@ -76,6 +78,18 @@ vi.mock("./useCreateController", () => ({
 vi.mock("@/hooks/debounce", () => ({
   useDebounce: <T,>(value: T) => ({ debouncedValue: value }),
 }));
+vi.mock("@/utils/connection/storage-access", () => ({
+  requestStorageAccess: () => mockRequestStorageAccess(),
+}));
+vi.mock("@cartridge/ui/utils", async () => {
+  const actual = await vi.importActual<typeof import("@cartridge/ui/utils")>(
+    "@cartridge/ui/utils",
+  );
+  return {
+    ...actual,
+    isIframe: () => mockIsIframe(),
+  };
+});
 describe("CreateController", () => {
   const defaultProps = {
     isSlot: false,
@@ -83,6 +97,7 @@ describe("CreateController", () => {
   };
   beforeEach(() => {
     vi.clearAllMocks();
+    mockIsIframe.mockReturnValue(false);
     // Set default mock returns
     mockUseCreateController.mockReturnValue({
       isLoading: false,
@@ -185,6 +200,51 @@ describe("CreateController", () => {
     });
   });
 
+  it("requests storage access on submit in iframe", async () => {
+    mockIsIframe.mockReturnValue(true);
+    const handleSubmit = vi.fn().mockResolvedValue(undefined);
+    const setAuthenticationStep = vi.fn();
+    mockUseCreateController.mockReturnValue({
+      isLoading: false,
+      error: undefined,
+      setError: vi.fn(),
+      handleSubmit,
+      authenticationStep: AuthenticationStep.FillForm,
+      setAuthenticationStep,
+      waitingForConfirmation: false,
+      changeWallet: false,
+      setChangeWallet: vi.fn(),
+      overlay: null,
+      setOverlay: vi.fn(),
+      signupOptions: ["webauthn"],
+      authMethod: undefined,
+      setAuthMethod: vi.fn(),
+    });
+    renderComponent();
+    const input = screen.getByPlaceholderText("Username");
+    fireEvent.change(input, { target: { value: "validuser" } });
+
+    // Ensure dropdown is closed by blurring input
+    fireEvent.blur(input);
+
+    // Wait for validation to be applied
+    await waitFor(() => {
+      const submitButton = screen.getByTestId("submit-button");
+      expect(submitButton).not.toBeDisabled();
+    });
+
+    // Submit form
+    const submitButton = screen.getByTestId("submit-button");
+    const form = submitButton.closest("form");
+    if (form) {
+      fireEvent.submit(form);
+    }
+
+    await waitFor(() => {
+      expect(mockRequestStorageAccess).toHaveBeenCalled();
+    });
+  });
+
   it("shows loading state during submission", async () => {
     mockUseCreateController.mockReturnValue({
       isLoading: true,
diff --git a/packages/keychain/src/components/connect/create/CreateController.tsx b/packages/keychain/src/components/connect/create/CreateController.tsx
index dfa03c97d..9e01d28d3 100644
--- a/packages/keychain/src/components/connect/create/CreateController.tsx
+++ b/packages/keychain/src/components/connect/create/CreateController.tsx
@@ -5,6 +5,7 @@ import { usePostHog } from "@/components/provider/posthog";
 import { useControllerTheme } from "@/hooks/connection";
 import { useDebounce } from "@/hooks/debounce";
 import { allUseSameAuth } from "@/utils/controller";
+import { requestStorageAccess } from "@/utils/connection/storage-access";
 import { AuthOption, AuthOptions } from "@cartridge/controller";
 import {
   CartridgeLogo,
@@ -31,6 +32,7 @@ import {
 } from "@/hooks/viewport";
 import { useDevice } from "@/hooks/device";
 import { AccountSearchResult } from "@/hooks/account";
+import { isIframe } from "@cartridge/ui/utils";
 
 interface CreateControllerViewProps {
   theme: VerifiableControllerTheme;
@@ -45,6 +47,7 @@ interface CreateControllerViewProps {
   onUsernameFocus: () => void;
   onUsernameClear: () => void;
   onSubmit: (authenticationMode?: AuthOption) => void;
+  onStorageAccessRequest: () => Promise<void>;
   onKeyDown: (e: React.KeyboardEvent) => void;
   isSlot?: boolean;
   authenticationStep: AuthenticationStep;
@@ -81,6 +84,7 @@ function CreateControllerForm({
   onUsernameChange,
   onUsernameFocus,
   onUsernameClear,
+  onStorageAccessRequest,
   onKeyDown,
   onSubmit,
   waitingForConfirmation,
@@ -195,13 +199,15 @@ function CreateControllerForm({
           height: layoutHeight,
         }}
         ref={layoutRef}
-        onSubmit={(e) => {
+        onSubmit={async (e) => {
           e.preventDefault();
           // Don't submit if dropdown is open
           if (isDropdownOpen) {
             return;
           }
 
+          await onStorageAccessRequest();
+
           if (keyboardIsOpen) {
             // If keyboard is open, mark for pending submit after it closes
             setPendingSubmitAfterKeyboardClose(true);
@@ -295,6 +301,7 @@ export function CreateControllerView({
   onUsernameFocus,
   onUsernameClear,
   onSubmit,
+  onStorageAccessRequest,
   onKeyDown,
   authenticationStep,
   setAuthenticationStep,
@@ -342,6 +349,7 @@ export function CreateControllerView({
           onUsernameChange={onUsernameChange}
           onUsernameFocus={onUsernameFocus}
           onUsernameClear={onUsernameClear}
+          onStorageAccessRequest={onStorageAccessRequest}
           onSubmit={onSubmit}
           onKeyDown={onKeyDown}
           waitingForConfirmation={waitingForConfirmation}
@@ -359,6 +367,7 @@ export function CreateControllerView({
           isLoading={isLoading}
           validation={validation}
           onSubmit={onSubmit}
+          onStorageAccessRequest={onStorageAccessRequest}
           authOptions={authOptions}
           isOpen={authenticationStep === AuthenticationStep.ChooseMethod}
         />
@@ -495,6 +504,21 @@ export function CreateController({
     ],
   );
 
+  const handleStorageAccessRequest = useCallback(async () => {
+    if (!isIframe()) {
+      return;
+    }
+
+    try {
+      await requestStorageAccess();
+    } catch (error) {
+      console.error(
+        "[CreateController] Storage access request failed:",
+        error,
+      );
+    }
+  }, []);
+
   useEffect(() => {
     if (
       pendingSubmitRef.current &&
@@ -587,8 +611,6 @@ export function CreateController({
     canSubmit,
     authenticationStep,
     isDropdownOpen,
-    setAuthMethod,
-    handleFormSubmit,
   ]);
 
   // Reset authMethod and pendingSubmit when sheet is closed
@@ -612,6 +634,7 @@ export function CreateController({
         onUsernameFocus={handleUsernameFocus}
         onUsernameClear={handleUsernameClear}
         onSubmit={handleFormSubmit}
+        onStorageAccessRequest={handleStorageAccessRequest}
         onKeyDown={handleKeyDown}
         authenticationStep={authenticationStep}
         setAuthenticationStep={setAuthenticationStep}