Authentication problems with work account.

Thanks for the answer.

I went through the specified links again and tried to do everything as described again.

At the moment, the problem with access to the work account has not been resolved.

The system does not allow me to create another work account from the same domain.
I cannot contact technical support. I do not have access to the Fabric portal, since I was the only administrator.
When trying to contact the support service by phone, I cannot get past the answering machine.
I often receive messages like "Purview Hub (automatically generated) data refresh disabled" to my work address..., there were unfinished and undeleted exercises in Fabric (no access).
Thus, I cannot switch from the trial period to another functionality or delete training materials. In general, no actions on the portal are possible on behalf of my organization (domain), and I cannot log in to my work account.
I understand that security is very important, but I wanted it to be provided without such problems.

"Support" from Microsoft is a separate topic altogether...

And after such an experience, how would I answer the question "Would you recommend Microsoft Fabric" ...