Unfortunately this is not true,
It is funny that an issue like this got a support answer like this.
I am an ex blue badge with long time experience in Microsoft technology and I am still providing professional consultancy to large corporate but I could never imagine a naive answer like "go incognito and you will be fine" which sounds like the old school answer "delete the cookies and you will be fine" that was given to people when you want to drop their problem as you do not understand how to resolve.
I have tried Safari on my MacBook, Edge on Azure Virtual Desktop, Windows 10 on my son laptop, edge on my windows 11 Lenovo laptop on incognito or not even in a brand new desktop and the same error happen while I am logging using my linkedin account
This is the result I am getting from all the previous:

I wonder how the support can confirm something that does not work for me.
Honestly I was expecting a better handling of the case and maybe a teams call to validate that it works for me.
So I am looking forward to the solution and you might help to escalate this as it is lagging since the beginning of April.
Luigi