Zoom will not connect to my camera

My internal camera used to work fine on Zoom, but it has suddenly stopped working. Here are the things I have already tried:

• Gone into Zoom camera settings - no image shows up, just a grey screen. 
• Gone into my computer's settings > camera permissions - camera is enabled everywhere and Zoom is not even listed
• I have turned my computer off and on again many times...
• I have uninstalled Zoom and reinstalled the latest version
• No apps are running in the background

My camera works everywhere else.

I have a Windows 10 computer (MSi brand) and am currently using version 5.14.6 (15434) of Zoom. I also have the same issue when I connect to calls through the web for some reason... They both just stopped working all at once. But works fine on my phone.

Please can someone help?