Camera turning off with one specific institution

Using Zoom workplace. Have no problems with meetings with my 2 sons who are also using zoom workplace.

When the Mayo clinic tries to connect with me, I get an indication that my camera is not working. The video icon is red as though the camera is off and I can't turn it on. Get a little popup saying my camera is not working.

They can't see me, I can see them, and we can both hear each other.

All of the tests, even on the Mayo site result in perfect performance-audio, visual, etc.,

They do these video sessions with plenty of patients with no problems, so I'm guessing its a setting problem.

I have uninstalled and re-installed Zoom changed usb ports. Camera is fine except for this.

Any ideas?

Thanks