Webcam no signal

Trying to set up webcams on by minions and for the life of me I cannot get any image to show.
I have used combinations of Pi Zero 2W, Pi 4B, Pi camera v3, OV5647. All get the same result - "No Signal on black screen.
Fresh installs of RatOS & Crowsnest V4 is installed. Tried ustreamer, camera-streamer, the lot.
To me it looks like the webcam service is all ok, just no actual image.

Any help here would be greatly appreciated before I lose all my hair...
Images and log attached.
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