Cannot share file using windows desktop client

Screenshot 2021-08-23 082828
everytime I want to share files/directory from desktop client, I got the error so I can’t find user I want to share with. but if I share it using web interface, it got no trouble. fyi, the synchronization is fine. what should I do?

I’m using nextcloud desktop client version 3.3.1 running on windows 10 21H1.