I have been unable to use SMS MFA authentication with ThinOS 9.1. The SMS test come thru but there is no place to type the pin on the login panel. Microsoft Authenticator works fine. Has anyone experienced this?
If you are using Dell Thin client for this case, maybe you can reach out to Dell support/community for help. SMS is covered in Dell test scope, it should work well with their ThinOS 9.1 release build.