It seems to be a Hardware related issue.
Boot into Safe Mode
Try camera
If green tint is still there → 100% hardware issue
Try camera app in
Microsoft Teams
Zoom
If all show green → confirms it's not app-specific
The Surface Book 2 has a separate IR camera for Windows Hello. Sometimes it interferes with the regular camera feed. Go to Device Manager → Cameras or Imaging Devices, find the IR camera , right-click → Disable device. Then test the regular camera.