When adding the vaccum x20+ It tells me "unknown model".

[Kiggerbare]

Looking at supported devices, it should be, and also finds the name mentioned for it (xiaomi.vacuum.c102gl).
After polling, it shows up like I would expect for a few seconds.

But then switch to this screen.

Telling
Device Unavailable
Device is unreachable: Cannot read properties of undefined (reading 'toString')

What more do you need from me to troubleshoot this?

[shaarkys]

I haven't seen any log from you, so can't tell, but there were several fixed implemented based on my testing and device shall work. Please ensure you are on latest test version - https://homey.app/en-us/app/com.xiaomi-miio/Xiaomi-Mi-Home/test/

[Kiggerbare]

Sorry, didn't know about the logs, but it seems to be fixed in the test version.
Thank you so much for your work on this, and hope you have a great weekend.