Just for documentation purposes, fixed it!
The previous owner of the blinds had a Tahoma as well and once connected it is not possible to connect another Tahoma unless you reset the motors one by one…
So that’s what I did and now it is working fine. Thanks to Somfy support, apparently their support by phone is much better than via mail.
So the working solution was to reset the blinds/motors (sorry Dutch): Hoe reset je een Somfy IO motor? Leer het hier - YouTube
