Participants not recognised

Hi 

I set up Zoom originally on a Windows 10 PC.  It works perfectly.

I also set Zoom on my Windows 11 Laptop.  Initially I set up a separate "id" for it.  I have not used the laptop version for 6 months and now that "id" no longer works.

Despite having re-loaded Zoom on the laptop, when the laptop is the host, it refuses to acknowledge that there are participants.  Any participant can see the host, but they are left in the waiting room, because the host does not 'see' them.

Any ideas??