I've tried every possible way to fix the authentication but none have returned results, the ones i've tried includes:
- GenSMBIOS (multiple times)
- Changing mac address
- Switching accounts
- Creating new accounts
1- Delete the cache and keys after each attempt. Right now I can't help you without any information.Author: @maikthechicken
2- Sometimes you need to call Apple (depends on whether you get an error code) and they can fix it.

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