Can load build into TestFlight

I tried to upload my build into testflight with XCode -> Product -> Archive -> Distribute App but this error keeps showing up: "No Team Found in Archive, Use the Signing & Capabilities editor to assign a team to the targets and build a new archive." However, my Apple ID IS connected and the bundle ID is the same as in my App Store Connect. What can I do? I tried deleting all archives, restarting Xcode & my Mac, still nothing happend. I can't get it to upload...