Big Sur Update Issue: "Authentication server could not be contacted"

I have 2 macbook pro.
  • first one (macbook pro 15' 2018) has just one user and it went just fine.

  • second (macbook pro 13' 2017) has a problem.

Problem:
The system makes me to recreate password. I was trying to do that, but could not. Having error: Authentication server could't be contacted

What is that? I can't work because of that update!
What I have to do?

Big Sur Update Issue: "Authentication server could not be contacted"
 
 
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