I’m using a Mac Mini M2 with macOS Sequoia 15.1 and running a virtual machine with the same OS. While logging into my account works in System Settings, adding it to Xcode 16.1 fails after the initial login with a decoding error:
Decoding Error
There was a failure decoding response: (HTTP 401, 60 bytes).
There are similar issues in
https://developer.apple.com/forums/thread/767673
and
https://developer.apple.com/forums/thread/759877
ruslankim
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution