Thanks Olsche, but unfortunately this didn't help. I see many people on the shelly support pages on Facebook with the same problem as me. Unfortunately I don't see any solution.
Would it help if I sent my device IDs to the Shelly to have them check them in the cloud, in case something there is 'blocked'?
I really need to get this fixed, as having them without alarm / notification is not helpful for me.
Thanks for your support so far.