Hi @Lynn Nguyen ,
Welcome to Q&A forum!
According to your description, only some employee users encounter this problem, right?
You have also tried many troubleshooting methods, but none of them worked. I also tested it and it did not have the same problem as yours. It works normally. In summary, this seems to be a random issue. We recommend that you wait for some days to see if the problem is solved. In the meantime, you can use PowerShell as a workaround to move the files.
Reference:
https://www.sharepointdiary.com/2018/03/sharepoint-online-move-files-using-powershell.html
Non-official, just for reference.
Good day!
If the answer is helpful, please click "Accept as Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
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.