Hi there
Please try this
Tap the Power Button: Instead of pressing keys or clicking the mouse, give the physical power button on your Mac Studio a single, quick press to trigger a hardware re-handshake with the display.
Power Cycle the Monitor: Turn your aftermarket display off and back on manually, or unplug and re-plug its HDMI/DisplayPort/Thunderbolt cable. This forces the Mac to re-enumerate the video output.
Check for Legacy Drivers or Architecture Changes: Major macOS upgrades often deprecate older kernel extensions or transitional software frameworks (like phasing out older Intel/Rosetta-dependent drivers), which commonly breaks third-party hardware like webcams.
Check macOS Permissions: Go to System Settings > Privacy & Security > Camera and ensure your preferred apps (Zoom, Teams, etc.) or Logitech software have toggles enabled.
Remove Conflicting Software: Completely uninstall Logitech's proprietary software (Logi Options+ or Logi Tune) if the latest driver is failing, and let native macOS drivers handle the USB video class (UVC) device.
Try a Direct USB-A/USB-C Port: Bypass any external hubs or monitors with built-in USB ports and plug the Logitech camera directly into the back of the Mac Studio.