v4l2loopback: Virtual camera exists, but doesn't show up in Zoom, and doesn't work in Cheese

I have successfully set up the virtual camera in OBS: sudo apt install obs-studio v4l2loopback-dkms sudo usermod -aG video myuser The following versions are installed: v4l2loopback-dkms 0.12.5-1 obs-studio 26.1.2+dfsg1-1~ubuntu20.10.1~ppa1 Kernel: 5.11.0-11-lowlatency After a reboot, the virtual camera button and settings are showing up in OBS, and clicking the start button creates the following CLI output: info: Virtual camera started info: ==== Virtual Camera Start ========================================== It also seems to work according to v4l2-ctl: $ v4l2-ctl --list-devices OBS Virtual Camera (platform:v4l2loopback-000): /dev/video6 USB 2.0 Camera: USB 2.0 Camera (usb-0000:00:14.0-4.2): /dev/video4 /dev/video5 /dev/media2 Integrated_Webcam_HD: Integrate (usb-0000:00:14.0-6): /dev/video0 /dev/video1 /dev/video2 /dev/video3 /dev/media0 /dev/media1 After changing the refresh rate in OBS -> Settings -> Video to **30 fps**, the virtual camera also shows up in **Cheese**, but selecting it there, Cheese can not use it and displays an error There was an error playing video from the webcam. Cheese does not create any CLI output. In **Zoom**, the virtual camera does not show up in the selection menu at all. I also experimented with different **color format** settings in OBS -> Settings -> Advanced, but to no avail, it doesn't affect the outcome. Any idea what could be a reason? [Update:] The virtual camera works when using VLC. This to me indicates a problem with the output format. However, I have tested all possible output resolutions, frame rates, and color formats offered by OBS, and none work with Cheese or Zoom.