Issues with zoom

Really hoping someone can help.

I have an i7 early 2015 macbook pro I gifted to my daughter for her home schooling. The old ios was no longer supported so key apps like Word etc didn't work.

I used the OCLP tool. It offered sequiona the latest ios so that's what I went for. Worked fine, took forever and at the end I had to force reboot. Seemed to have been fine apart from zoom calls. Her teacher shares her zoom whiteboard but my daughter can't see the shared screen. Just stays on 'loading'. Have tried the app. Tried browser. Different browsers. Nothing seems to be able to get the shared screen to show (video call seems to work otherwise ie they can see each other). Her tutor won't use any other alternative to zoom, either.

I did use the patcher at the end and I'm sure it confirmed the patches.

Any ideas what I should do? Please.

Author: @HSPmale