Error message received when closing Word/outlook

Having some problems with the office package.
Freshly installed laptop, domain-joined.

Service: Office365
Application: Word, Outlook

The application itself works, however when we close the application we are met with an error message.
(Outlook gives same error message, except file is named "NormalEmail.dotm")

Error message: "Word cannot create or save the file, Disk could be full, write-protected or damaged.
(Normal)

If i start the application as an admin, then try to close it:
Error message: "Word cannot create or save this file, Disk could be full, write-protected or damaged.
(C:\Users\XXXX\...\Normal.dotm)

Closing down the error message gives us a prompt to save Normal.dotm to a location.
Saving the file to e.g Desktop, then opening up word and closing it gives us same error msg.

Checked the access-rights to: AppData\Roaming\Microsoft\Templates - User has full access
Checked if the files in the location written above were write-protected - They arnt write protected
Tried to transfer my ..\Template folder to his computer - No difference, same error message
Ive done quick repair, online repair, full re-install of office package - Same error message

We are using a template add-on/program if that could cause any issue?
User is local admin.

I have attached a image of the error message, however, its in Swedish.