Server QR Code doesn't re-sync with phone app
Ongoing issue, probably for at least 1-1/2 years: After loosing connection between my phone (Samsung S23) and the server, I can't reset via the QR code. Manual connection usually works however.
This is typically because you are getting the new URL from the server, but then firebase is what has the "old" URL and it's syncing and overwriting the QR code.
The way to fix it is to fix firebase first. Check your Firestore at https://console.firebase.com
See if your server URL matches the database. If not, that's your issue. You may need to re-use the firebase setup and verify that your URL is being set properly.
I actually found a server bug around this recently. You could be hitting that... I think a workaround is to use the restart services button in the debug page's manage drop down