I am unable to add a remote NVR to a window client (v8.7.3) via UID.

It adds perfectly to the mobile app. It prompts for a password on the mobile app, but doesn't seem to do that on the windows client.

I've tried adding the NVR on multiple computers with the Windows client and none of them prompt for a password.
Tried running in as admin.
Tried turning off Add Devices Automatically

Please excuse the novice here.
Is there a way to setup an app that views individual cameras from multiple locations?

Currently we have an NVR in each location and I have been successful at adding each NVR to the app, but not individual cameras.

Ultimately, I would like one app to show the front door camera at each separate location on one screen.

TIA!