I'm having this issue as well for Adhoc distribution with Automatic manage signing turned on.
I built on my MacBook running Catalina (10.15.7) and Xcode v12.3 but with the Command Line Tools of Xcode 11.3.1.
dpaiva
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