Pool member of an 445 VS can't access VIP when itself is the active member

There seem to have been a couple posts about this but the solutions aren't working for me. I'm having this issue on both 10.x and 11.x

I have a VS of IP:445 and 2 members on :445 setup as priority groups so that only 1 is active and the other "standby"

The nodes are dual purposed, and they themselves need to access this file share via the VIP. When I access the VIP from the "standby" node of the 445 pool, it works fine (connection hits the other node), but when I access the VS on the "active" node, it shows a dialog stating username or password is incorrect while prompting for new credentials. So I can't access the file share via the VIP when it's connecting to itself.

I have automap enabled (the standard for us...LTM's are on a stick) and the rest of the VS settings are default.

I thought this was working fine at some point, so maybe this is an OS issue (Win2012r2) vs. LTM but I'm using LTM so I'm hoping to find a solution here.

Anyone know what's going on?