Hello All - We currently have an RDS deployment configured in our Azure environment but can't get MFA properly setup.
Current Setup.
Azure MFA Server is currently installed on our RD Gateway Server which is also our RD Web Access Server.
When users access the RDS Web front-end website (https://rds.domain.com which redirects them to https://rds.domain.com/rdweb) the users are asked to enter in their username and password. Once they hit "Sign in" they get the following error. 
We are trying to achieve the following scenario. Users log into the site and then are presented with an MFA challenge on their phone. They accept it on the phone and it lets them into the portal where they can launch any RemoteApp without having to authenticate
again.
Thanks!