webcam image rotated 180 degrees

Just bought and set up my ATEM mini pro.All worked well until today when the HDMi output on Zoom call was rotated from horizontal to vertical. Using zoom with direct computer USB to DSLR was fine on Zoom. No such problem with Skype. Any suggestions how to get webcam output back to horizontal on Zoom?

Hmmmm you might have to use OBS and its Virtual Camera to pull off what you are looking to do.

Self image flip is an option in Zoom settings.

The other meeting peeps see you correct way around.