Zoom Workplace not recognising internet connection

Hi.

I've just been 'upgraded' to Zoom Workplaces. When I try a log in I get "You are unable to connect to Zoom. Please check your connection and try again" My wired connection is just fine. Running MacOS Samona 14.5 on a MacBook Pro. Doesn't work on iPad but does on iPhone.

I've tried all the uninstall, clear cache, reinstall etc etc and nothing works. I'm assuming it's a security issue but can't work it out. Appreciate any solution ideas.