Remote Desktop gateway users prompted for Azure MFA several times a day
We have a Remote Desktop gateway using Azure MFA (plugins installed on a sperate NPS).
The Remote Desktop gateway and the NPS are both running on Windows Server 2012 R2.
Our users have a phone call to mobile phone to confirm login. Works fine. They use the native Remote Desktop client in Windows with the advanced option to "connect from anywhere" and specify a server name.
Users are complaining that they get several phone calls to confirm login after they are already connected to the Remote Desktop. I looked at the activity logs in Azure admin center and they get a phone call every hour or so.
Why?