When a local binary build of the Engine is created on a Mac, the iPhonePackager is not copied over into the new local binary build. This prevents iOS certs and provisions from being imported into projects.
Note that iPhonePackager.exe is not present in the local binary build, which prevents certs and provisions from being imported for iOS projects.
The iPhonePackager.exe is copied over into the local binary build when it is being created.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-58493 in the post.