Many thanks for your detailed answer - wow!
I normally use Google Chrome; the new laptop has Microsoft Bing.
Everything working fine accessing the meetings I have set up on my old laptop. No reports in Kaspersky on new one.
What happened was, I tried to access the meeting I have set up as a test on the new laptop. A kaspersky box flashed up about blocking ????? - I pressed it too quickly. So, from here. when I, as per normal, pressed start meeting in Zoom, the meeting will not start on my new laptop - it will on my old one!
I am using a different Kaspersky activation code and account on my new laptop.
Any inspiration? I did wonder about linking it to my old activation code in Kaspersky as I have a couple of spare licenses..to see if that would resolve the problem. It was a pop up window in kaspersky that was the problem.