Just wanted to piggy back this and say that I am experiencing the same issue.
Xcode 11.1 crashing when double clicking a .mobileprovision
Me too. So...how is anyone using Xcode right now?
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I crashed also(xCode 11.1), but I found two workaround solutions:
1 project targets setting---> signing&Capabilities --> Provising Profile ---> import Profile
2 You can import your profile when archive an ipa file.
xCode menu-->Product-->Archive-->Organizer-->(you target archives)-->Distribute App (on the right side of Organizer)-->Ad-hoc (example)-->next-->next-->select profile-->import profile.
It worked, thanks Michael!