This conversation took me ~1.5h (because each new agent needed to read whole conversation again).
In the end I didn't called "Technical Team" (really Adobe, how hard is to add some dropdown to select topic/category of talk?).
I tried one more time after couple hours and everything just worked fine. But still I can't understand WHY there is a message to contact a technical support when technical support don't even know what is MFA or web UI ?!
I'm sharing this here to warn everyone what want to use Adobe's "technical support" and Adobe's great great contact chat. This is THE WORST customer support I ever had.
Adobe customer care is mainly for billing, installation and activation issues. They really don't know much about how these user forums or the main website works because that's all handled by totally different teams of employees in different locations.
My advice is to log-in to your Adobe account profile page with a different browser that accepts cookies and does not have ad or script blockers. I prefer desktop Firefox or Chrome.