@BraswellJay said in Unable to mark NAS location trusted in Office:
I have a similar issue with a 3rd party developed application that uses an access database. The only way I could find to workaround was to add the trusted location through a registry edit. Here is the notes I have on what I did
I was able to add \\FileServer\Data\
via the built in GUI, by clicking Add new location and then browsing to Network and clicking on the FileServer item, etc. This added the location like this. This works, as I can open the file and have no warning about disabled macros, but is a work around. The Mapped Drive should work also.

I then exported the key and tweaked it to add K:\
in Location1
.
No luck opening the file via K:\
does not work.

Even though it does show up in trust center after adding via the registry.

As a side note, I can not click on K:\
entry in the GUI either. I can click on the other two entries.