Turns out I needed to go the Apple developer website and accept the new T&C. The error message was hidden by GitHub Actions since they don't show the complete log while a script is still running.
laurent22
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
Last seen
User for
Post
Replies
Boosts
Views
Activity
Tried again and it got cancelled after 6 hours of waiting. I will try to publish a new build to see if it makes a difference.