Xandr RTB error 200: Creative Filtered - General; reason unknown
What Xandr says
Xandr filtered the creative and did not say why.
Xandr reports this integer in the ${AUCTION_LOSS} macro on the bid's lurl. A search for Xandr RTB error 200 is this code.
What was checked
Xandr accepted the bid and rejected the creative. OpenRTB groups 200 through 215 as creative policy: size, format, security, category, attributes, or the app being promoted.
What to change
There is no narrower code on this loss.
The same number in OpenRTB
OpenRTB loss reason 200 is Creative Filtered - General; Reason Unknown. Xandr publishes this integer with that meaning.