Failed to find stub IPA when packaging for iOS. This also happens with File > Package > iOS.
Regression: Yes in 4.20 we fail with a different error during the build step:
More detailed investigation continues in the comments and the bug will be updated when there is a repro.
Result: Fails with Failing to find stub IPA
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-66097 in the post.