Not defaulting to MyPC Login Screen

Issue

After MyPC client install, reboot will not give the actual login screen for MyPC. Instead, it gives normal Mac login screen where if you

put the library card number, it will not login because it is looking for the actual Mac user.

You have to login and logout with actual Mac login to get MyPC login screen to enter library card and it will accept.

Resolution

Run the following sudo command 

sudo defaults delete /Library/Preferences/com.apple.loginwindow autoLoginUser

If this does not fix the issue then make sure File Vault is disabled in mac. 

File Vault should be disabled in mac for MyPC Login Screen to be the default login screen.