Hi Barry,
I just wanted to reply to your detailed post:
I had toggled all said settings and did the check you suggested which returned a positive result. I ended up with using the sub list form the API (which is not that reliable) and checking it for that twitch id which works quite good enough. You were probably right about the twitch rig giving inconsistent results in that case since I could not find another potential source for that error.
Thanks though I’m using a workaround now!
Merry Christmas!