Keystrokes not working when RDP window is minimized or disconnected

My bot is running fine and getting completed when RDP server is open. However it is unable to insert keystrokes when server is minimized or locked or disconnected. Has anyone faced this issue/ has solution for this?

Any help on this will be appreciated. Thanks!!

PS : I have already tried creating D-word through regedit settings (article 000001522) and checked power, local security policy and group editor policy (article 000001473).