@ajoslin103 Yes, this is known issue unfortunately that crept back in.
The issues is that this Playground has a dozen of so auth clients, and unfortunately there can be a race condition between Azue Active Directory and Supabase when handling the OAuth callback.
So, here, Azure picks it up ahead of Supabase.
We fixed in some time ago by using a specific Supabase callback page, but perhaps that setting got changed in the Supabase Auth or the GitHub app config.
Could you please write up an issue in the repo, as these types of issues and bugs will get lost in the Forum vs the issues list.