A cloud-based identity and access management service for securing user authentication and resource access
Hello Choi, Jacky Chun Wing
as Anton already says Private mode doesn´t pass the device, so case 1 and 2 land in your MFA path (read here). in case 3 and 4 Edge on Android can pass device identity.
"View desktop site" changes the user agent Conditional access reads the device plafrom from it (read here).So test case 3 once and check the sign in logs and you will see the Device Info shows the detected OS and Compliance and the Conditional access tab shows which policy applied.
Do your Policies use a device plaform condition or a device filter on deviceOwnership?
if you have no more question please Accept the Answer so others can also find it faster.