When will there be a fix for this error?
I do not think ist is an error/bug. Maybe you just don’t have an active subscription.
Possibly, if you could provide some more details about your problem… check account.infinite-flight.com to make sure you actually have a live sub.
Try restoring purchases
Try signing in.
Or check if it expired.
You probably haven’t followed through with the transaction, or your using a different Apple ID or email. Also check your inspire date.