I thought it was clear that I had already updated to 15.1.1, with no results unfortunately.
The strange thing is that this happens on one laptop, while the other laptop which is almost mirrored but on which I don't work with the phone, the calendar notifications for example come through, which doesn't happen on the laptop in question which no longer receives such notifications.
What I regret is not being able to interact from the computer with messages from the phone, but especially also for the convenience of all those SMS-sent codes that were automatically recognized in every application by the Apple system.
Now I can only hope, since it afflicts something and not everyone as we see, that we can figure out what the problem is because I think it is really a big problem.