Hello @Jerry Zhong
I found several workaroundS you might take a try:
1.On Remote Desktop session go to Window > User Name > Sing out (log off the session instead of disconnecting to see how it works.) At next sign-in the keyboard worked again;
2.Restarting the remote computer;
3.update the operating system and install all the hotfixes;
4.Go to control panel - ease of access - make keyboard easer to use, then turn off "turn on filter keys";
5.Change the keyboard combination in the Local Resources tab of the RDP entry to On the remote session and/or On the local computer to see if that help.
Best Regards
Karlie
If the Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.