Unfortunatelly, the above-mentioned solution did not work. I highly appreciated your answer as it was a great pointer for me to the topic "Secure Token", that is the underlying mechanism of all this. If somebody solved it - would be glad to learn from you. If I'll resolve it, I'll post the solution here. 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.
#Carbon copy cloner migration assistant pro
Now, I am sitting here with a brand new MacBook Pro and a seemingly unresolvable gaping security hole. by deleting PRAM or SMC or creating a new admin, then reboot and then try this one: All failed.
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.Used Carbon Copy Cloner (CCC) to clone the external boot HD to the internal MacBook's HD.Booted the cloned HD on my New MacBook Pro (which worked like a charm because I allowed this inside Startup Security Utility).Upgraded my old MacBook Pro to Mojave and used Carbon Copy Cloner to make a clone of the HD.
#Carbon copy cloner migration assistant password
Used the Startup Security Utility (used the password of this temporary admin) to allow booting from an external HD.Unpacked my brand new MacBook Pro and booted it once to have a "temporary admin".Here is what I did that lead to the catastrophy:
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. I am having a similar issue - here is the description why it happened to me.
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