I have exactly same problem, I start PC via wake-on-lan remotely, I can connect to AMD link but it is showing only lock screen, I can hear the game running in the background (makes sounds) but showing only lockscreen and I cannot get past it not even when attempting to use keyboard on android as controller and typing in the password, the letters dont appear in the password field of windows login (I presume because the keystrokes are forwarded directly to the running game...)
AMD this is a bug, please do something about it