Hi @Piero ,
Glad to hear this issue has been resolved!
Thanks for the sharing.
However, due to a recent update in forum policy, the question author now is not able to accept their own answers.
So I have written a brief summary of the solution this issue. Please feel free to accept it as the answer, which would benefit others who also has similar issues in forum.
Issue:
How to fix error code 0x800ccc92 on outlook
Solution:
OP first rechecked his Microsoft account and the various authentication methods, then reinstalled the old account that wasn't working and magically it started working again...