Notice the second ? in the URL, that should be an &. If you experience this issue, you can change that manually.
This is the easiest fix in the world, literally 1 character (maybe a few lines depending). Add me to the github and I'll do it for free, AdamKruschwitz on github.
I found an issue with the QR code, malformed URL if a not-logged-in user joins with their phone.
https://spelltable.wizards.com/game/7PAvHSO9tBGxrceoUPwjZ?camera=true?login=true
Notice the second ? in the URL, that should be an &. If you experience this issue, you can change that manually.
This is the easiest fix in the world, literally 1 character (maybe a few lines depending). Add me to the github and I'll do it for free, AdamKruschwitz on github.