Was missing 2 AirBnB stays from this summer (well over 2 statements ago) and I spent about 90 minutes on the phone with multiple customer service reps - none of them were even aware of this $200 vacation rental credit.
Eventually, a supervisor found the documentation on it and has put in a request for escalation... may take 10 days to hear back.
If you are missing your credit, get ready for a fight. (And based on the other FT thread about the $300 portal credit, it seems there are some problems with that as well.)
Way too much work when I'm spending $400/year for this card's annual fee. I'm pretty sure I'll end up canceling this card at renewal.