Xcode encountered an error in xcode 11.2.1
This is the bug in Xcode 11.2.1 I just logged in the accounts and download manual profile (The screen open from the Xcode > Preferences > Accounts)
If Download manual profiles does not work for you then -
1) open the older version of Xcode then 2) Add the provisioning profile. 3) Now quit the older version of Xcode and open the new version and it is added!