WVD and conditional access

Hi,

I am trying to achieve a MFA prompt every login attemp with conditional access. Webclient is working but the client is giving me some troubles. 

Following: https://docs.microsoft.com/nl-nl/azure/virtual-desktop/set-up-mfa and seeing https://www.youtube.com/watch?v=fR4JRrTt_Lk&feature=emb_imp_woyt&ab_channel=ChristiaanBrinkhoff

Is not giving me the same result. I am always seeing the "old" login promt rather than modern promt

any idea what it might be?

Michael