Invitees unable to join meeting

[TomtefarKuil]

I scheduled my weekly zoom meeting in the same way I have done for the last two years, using the "schedule a meeting" option on the sidebar.   This time (on 4/11/23) none of the invitees could get in using the link I sent.

I deleted that one and scheduled another one for 1/2 hour later, sent a new link and the same thing happened.