@Zenitus I was able to get past invalid_client by using the bundle identifier for client_id in the req as well as using x-www-form-urlencoded as the header

Hey, was facing the same issue. I removed Package.resolved from my .gitignore and pushed my Package.resolved to github. Yet xcode cloud still throws Package.resolved is missing from the repository. Anyone else facing this issue?

For me logging into GitHub with a personal access token fixed my issues.