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A Migrated Administrator password is created when upgrading from prior version of QuickBooks for mac. The owner password on the file is attached to the new Migrates Administrator user.
If the file you've convert from QuickBooks Desktop is asking for a password that wasn't set up before, we can reset it.
You can check out this reference for more details on how users and passwords work in QuickBooks for Mac.
Reach out to me if you need anything else.