Problem on creating a subfolder in QDLS

Hello everyone

I have a problem creating folders on QDLS; I try to explain myself better:

I need to install a product on a PC, which must create a subfolder on a
folder that already exists on the QDLS; the folder is mapped via a network
drive on the pc in question; but when the installer or even if I do it
manually tries to create the subfolder it gives me the following error:

"Unable to create folder. Unexpected error. If the error persists, you can
use the error code to search for more information about the problem. Error
0x8000FFFF: Fatal error"

I checked the permissions on the folder and I saw that the user, which I use
to connect to AS400, has all the permissions .. what could be the problem?
on the pc I have windows 10 and on AS400 I have the V7R1 thanks in advance

Gio