There is a notice on the status page that the device controller problem occurring on 5 May 2022 has now been identified and fixed.
The symptom was being unable to add a new device or getting an error message in the app about a device controller update being needed or the app just getting stuck and not completing an action.
If you had this problem, try it again. If not yet fixed for you, notify support.
I saw posts related to this issue pop up yesterday on at least 8 different threads, some years old. Rather than try to chase down all the individual conversations, which might require my listening to more than 200 posts to find the references, I’m just going to post this here. This same symptom/error message can occur for multiple different reasons, but the one that happened on 5 May 2022 was a specific platform issue that should now be resolved.