why can't my meeting be opened by anyone anymore?

I have set up a meeting room for my membership, which was accessible all the time for everybody, by setting it up as a repeatable meeting without waiting room, but meetincode. So everybody with this link could enter the room, without me / the host having opened it.

Suddenly, this is not working anymore, although I didn't change any settings of this meeting.

I use Zoom in my desktop with Safari, so an old version can't be the problem...