Azure AD MFA NPS Extension wont work

Hello,

I recently followed this MS doc to configure the NPS extension to enable MFA on the remote desktop gateway : https://docs.microsoft.com/en-us/azure/active-directory/authentication/howto-mfa-nps-extension-rdg 

No errors popped up when configuring, when i try to log in with an mfa enbled user, it wil log in without asking for the second factor. I went over the doc again but every step was configured correctly. Am i missing a step?

Thanks!