Failed to create temp directory /home/.tmp : Permission denied

SYSTEM INFORMATION
OS type and version ubuntu 20.04
Webmin version Latest
Usermin version Latest

I get this error when I try to go to inbox using usermin. What do I do wrong

Failed to create temp directory /home/.tmp : Permission denied

You’re not sudo or wheeler user…

Your home directory for the user does not make sense. You can’t set a user home dir to /home.

How did you create the user? What kind of user is it?