Specify serviceUrl when sending proactive message

[Benjiiim]

According to Proactive Messaging documentation and to App.ts code, we don't need to provide a serviceUrl when sending a proactive message / activity:

import { MessageActivity } from '@microsoft/teams.api';
import { App } from '@microsoft/teams.apps';
// ...

const sendProactiveNotification = async (userId: string) => {
  const conversationId = myConversationIdStorage.get(userId);
  if (!conversationId) {
    return;
  }
  const activity = new MessageActivity('Hey! It\'s been a while. How are you?');
  await app.send(conversationId, activity);
};

As far as I understand, the serviceUrl can be specified through app options, in env variable and defaults to https://smba.trafficmanager.net/teams

However, according to the Bot Framework REST API documentation:

The service URL will be the base URI for any subsequent requests that the bot issues in the context of this conversation. If your bot will need to send a proactive message to the user, be sure to save the value of serviceUrl.

and from the official Proactive messages documentation page:

Avoid hardcoding them. Instead, use serviceUrl from the incoming activity or conversation reference.

Moreover, according to Updates for Microsoft Teams bots in Multi-Geo environments:

the service URL for a tenant might change and so users in the same tenant might have different service URLs

I'm wondering why Teams SDK is not advising to store the serviceUrl next to each conversationId in order to use it when sending the message / activity instead of using the default URL?

[Benjiiim]

Adding @aacebo for thoughts. Thanks a lot

[Benjiiim]

Hello @aacebo. Your insights will be very appreciated on this subject. Thanks a lot.