I am having a similar issue - here is the description why it happened to me. I called the Apple support and they explained to me, that my issue is probably not solveable so may the following be a warning for you, dear reader, what you should NOT do: Migrate your old MacBook Pro to a new MacBook Pro with T2 chip using Carbon Copy Cloner, instead of Apple's built-in migration assistant.
Stupidly though, using Carbon Copy Cloner, I overwrote the Mojave version of my backup with the Catalina installation when I upgraded from 10.15.0 10.15.1 in the hopes that it would return my sleep functionality to normalcy. Of course, it definitely didn’t do that. MacOS - Apps and Programs. Upgrade to Mojave. I’d like to take this opportunity to say I’ve been extremely happy with Carbon Copy Cloner and Bombich Software over the four years I’ve been a customer. CCC is a truly outstanding piece of crafted software with top-notch support (I love the integrated help and support features) offered by a reliable and professionally-run company.
From the moment that Apple introduced Mojave to developers in June, we've been putting it through its paces to see what we can expect when Mac users apply the upgrade this Fall, and to get CCC 5 qualified on this new OS. We're happy to announce that CCC 5.1.5, available today, is fully qualified on macOS Mojave. Getting Ready to Upgrade to Mojave.
Here is what I did that lead to the catastrophy:
- Unpacked my brand new MacBook Pro and booted it once to have a 'temporary admin'.
- Used the Startup Security Utility (used the password of this temporary admin) to allow booting from an external HD
- Upgraded my old MacBook Pro to Mojave and used Carbon Copy Cloner to make a clone of the HD
- Booted the cloned HD on my New MacBook Pro (which worked like a charm because I allowed this inside Startup Security Utility)
- Used Carbon Copy Cloner (CCC) to clone the external boot HD to the internal MacBook's HD
- Removed the external HD
- Rebooted my new MacBook
- WORKED LIKE A CHARM: The new MacBook 'feels' like the old one, my old admin user is there, all my apps are there, I can configure everything. Everything just works.
- Well - not everything: When I tried to go back to the Startup Security Utility with the intension to now disable the right to boot from external HDs (to increase security, because I only wanted to allow this for my migration via CCC) the error message 'No administrator was found.' is coming up.
All my attempts to resolve this, e.g. by deleting PRAM or SMC or creating a new admin, then reboot and then try this one: All failed.
Now, I am sitting here with a brand new MacBook Pro and a seemingly unresolvable gaping security hole.
I cannot really believe that this is really an unresolvable issue, so I will try more Apple support employees by calling the support again and I will try to google even more. If I'll resolve it, I'll post the solution here.
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