Thanks for your reply!
Well, I probably got the assumption that my account got deleted from https://www.somfy-connect.com/ for calling too regularly for status checks.
The account was deleted 3 times in about 48 hours, and the 3 times I had to re-pair my IOs by resetting them, as the TAHOMA I have wouldn’t accept re-pairing them again.
For this reason I had to go the route of developer mode / local API, that’s not yet available AFAIK in the official release, hence went for HACS.
I’ve now put the post at the post you suggested