I am operating Office 365 on Windows 11 and am having the exact same issue.
When I have copied something and I right click so I may paste, the ONLY option I am given is "Emoji". Copy and Cut are greyed out, I assume because what I want to paste is already on the clipboard. (When there is nothing on the clipboard and I right click, I am offered Emoji, Copy, Cut.)
This forum will not let me upload the example screenshot, either. This error has been happening for the past few days and it is extremely frustrating!
Sajjad's answer suggestion was not successful.