How to fix iMessage and Facetime in macOS Big Sur?

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.
2- Sometimes you need to call Apple (depends on whether you get an error code) and they can fix it.
submitted by /u/maikthechicken
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