They are based on the device properties... it's in the name :) Devices are not registered per user, anyone in the company can login on an AAD joined device without having to go over any additional steps.
Are the Device Filter policies for Conditional Access based on the Device in general or the User Signing in?
Does the Filter Apply to the properties of the User Signing in or the Device?
My policy that is supposed to apply to Devices that aren't AD Registered is not working for my test user. The Device is AD Registered but for a different user than the one signing in now.
See the image for my policy. We have a policy that triggers MFA for registering devices, the only time we want MFA to trigger, we then block access for devices not registered, AD joined or Hybrid joined.
I have a device that is AD registered for one user but not for another, when the non-registered user signs in the MFA allows him to access but he is not AD registered for that device.
I though each time a user signs into a device with their M365 account it AD registers the device, was this changed?