Hi there! I am not sure I know what you mean. That is right (and the correct behavior); FaceRig needs the camera free, so to say. If a different software is using the camera and you launch FaceRig, then FaceRig will not be able to load and use the camera, and vice-versa. While the camera is in use in FaceRig, you won't be able to use it with a different software.

What errational is asking here is something I was actually about to come here and ask about by making a new thread.

In the past, you could use the Picture-in-Picture function to hide the avatar and display the original webcam feed as full-screen in the background, in effect passing the feed directly through the Facerig virtual webcam. (Listed on this page as "webcam feed box is full screen, taking the place of the avatar")
https://facerig.com/docs/facerig-studio-docs/basic-user-interface/picture-in-picture/

In the past, I could use this function to use my main webcam feed as default, and then switch to a Facerig avatar for a quick cutaway gag while streaming (like in this clip, for example).
https://clips.twitch.tv/ComfortablePreciousAntelopeDoritosChip

However, at some point that feature was apparently removed, as the Picture-in-Picture option no longer allows you to do that (only allowing you to enable/disable the webcam feed box in the lower left corner). I haven't been able to find another way of passing the main feed through Facerig, so it's been very difficult to switch between my original feed and Facerig's display (requiring an extended setup of closing/opening Facerig and activating/deactivating my webcam feed in OBS every time I want to switch). As I've been forced to commit to either using one feed or another, I've had to put Facerig aside for the most part, only using it for extended gags or dedicated Facerig streams.

Is there another way of passing the main feed directly through Facerig, so that a user wouldn't have to switch cameras and close Facerig to "disable" Facerig and show the main feed to viewers instead?

It still is possible to cycle through the picture-in-picture mode and have the camera feed on the whole screen. It might be because of a toggle that we implemented that you can cycle through two modes only - streamers had problems with the picture-in-picture mode during streams, which meant they activated it by mistake, thus revealing their face.

You can find this toggle (which is ON by default) in General Options > Preferences > General > "Hide webcam feed while broadcasting".

Got it! Thanks so much!

This answers my question too.