No connect to server-side subfolders via NFS


I have the problem that I cannot share server-side subfolders via NFS.

For example, the following structure on the NAS:


I can share the Hub folder without any problems. I can do and see everything as I want.
It is also displayed correctly in the file system as nfs4.

However, if I want to share the PC1 folder in the same way, it is not mounted.
Since it works once and not once, I’m a bit at a loss and don’t know what information to post.

Has anyone ever had a problem like this?

If anyone has a similar issue;

I was able to solve it by changing and saving the owner and group.
Then configure the desired user and group and customize the permissions.

This seems like a bug or is the GUI a bit sensitive?