How do I create a non-player user with User Management enabled?

I want to create a non-player user for use with the Monk’s Common Display package so I can record my session. I have User Management enabled (great feature, I love it!), but I’m not sure how to accomplish that with this configuration. The way I have in mind that I’d like it to work is that I’d open a second browser tab as the GM and use “Log in as…” to switch that tab to this non-player user, but I’m open to suggestions.

I did see that you can create unassigned Foundry users, which I thought would do what I was looking for, but I’ve already tried creating a user there, and it fails to show up in the player list, as well as in the “Log in as…” options.

I’m hoping it’s not necessary to create a second Forge account to do this (if that’s the case now, please consider this a UX improvement request).

Side note: It would also be cool if you could do “Log in as…” right from the User Management screen.