I don't disagree with anything that's been said, but to clarify, I don't think most of the folks on this thread are consumer users.
An enterprise-focused workaround - like a registry key we can push via AD Group Policy - would be a perfect solution.
I'm optimistic that, like most other Windows features, this feature code runs only after a prerequisite check, including an enable/disable registry key for debugging, and we just haven't found it yet!
This is super annoying! Does not make any sense the amount of clicks that I have to do now to choose the security key. Why not the option to select a default?
Likely because security keys are really quite rare for Microsoft personal account users who are typically consumer users.
Yes, CardinalDBeiter, as I believe I mentioned in at least one post once I realized it, many of you have been in the wrong forums all along, since this Community is really intended for consumer suers and not Work and Home users of Azure.
Even if you're a consumer small business with an Azure account, the support for this is still in the Microsoft Learn - Q & A Forums and not here, since most volunteers here aren't aware of the specifics of your issues, which is why this thread hasn't resolved anything for most of you. I'm sure I tried to tell you all that at least once as well, you're wasting your time here.
< EDIT > Oops, sorry CardinalDBeiter, I mixed this thread up with another regarding the Authenticator, so I'm not sure I actually did mention the Microsoft Learn forums here before, since otherwise the threads have lots of similarities.
Probably many of those in this thread actually belong here, while you and anyone lese with an Azure account should be posting in Microsoft Learn, even if the issue itself with the interface seems exactly the same, since the backends that support them are different.
In fact, it just may be that's this is the reason for the current issue, since trying to make these interface operations work properly on both the Azure and older Microsoft personal (e.g. Microsoft 365, Outlook.com, Windows Live, Hotmail) backends is likely a bit of a nightmare. I know that other Authenticator thread has shown this to be true.
Rob