Xandr RTB error 210: Creative Filtered - Creative Attribute Exclusions
What Xandr says
A creative attribute is excluded.
Xandr reports this integer in the ${AUCTION_LOSS} macro on the bid's lurl. A search for Xandr RTB error 210 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
Drop the blocked attribute.
The same number in OpenRTB
OpenRTB loss reason 210 is Creative Filtered - Creative Attribute Exclusions. Xandr publishes this integer with that meaning.