ANUNAYA THAKUR
ANUNAYA THAKUR
I don't know I have not tried.
Is the login window a window created using winforms, WPF, UWP or the Microsoft authentication. Please also check if the username window is part of the same UI tree or...
Can you check https://community.fortra.com/kb-nav/kb-article/?id=548d72cc-68c3-eb11-bacc-000d3a1fe4c0&redirect=false Also have a look at #147
The error is very clear. Set value method is not supported. Use send keys instead 
I have worked on azure VM and it works fine. Not sure about ec2 better ask support from AWS. Also how do you know if the application is even launched...
Better implement screen recording. Depending on the language binding won't take much effort.
Usually I used to get this error either WinAppDriver.exe crashed or the system got locked.
Are you using xpath then it will be too slow. Try using some other methods like name, automation ID etc...
By default it will run as a user. Unless you specify to run it as admin.
Is it azure ADO task? If yes then run the test agent as user and not admin.