would not let me in meetings yesterday

I tried to get into two zoom meetings yesterday (both invites from the same organization).  Identical to weekly meetings I’ve been zooming for almost six years.

I was taken to the meeting site, and could see the others...but just for a brief moment.  Then a screen went up and said my device could not enter the network.

My laptop is the same one that has been on the other zoom calls...and I have made no changes to it since last week’s meetings.

Anyone got any advice?