Error 0x104

We are sorry you are running into issues. To discuss issues we recommend to share your problem on our Tech Community forum (https://aka.ms/wvdtc) or open a support ticket after you have reviewed the troubleshooting options in our documentation (Windows Virtual Desktop troubleshooting overview - Azure | Microsoft Docs)

We recommend to review our troubleshooting section first. The other option you have is to open a support ticket through the Azure Portal.

UPD. I continued the topic here. https://learn.microsoft.com/en-us/answers/questions/1301619/error-0x104-connecting-rdp-mobile-to-the-server-fr

When I switched from Samsung to Xiaomi Mi 10, I also encountered this problem.

Also faced such a problem on my smartphone. Does anyone know how to fix this??

Help. Does anyone know how to fix this problem??

I also encountered this problem in the official Microsoft RDP client for Android. And what is most interesting, this error is only on new Xiaomi and POCO smartphones with MIUI 14.

There is a feeling that there is no certificate in Xiaomi smartphones or it is blocked on Microsoft's side.