Unity RTB error 1003: Max age rating exceeded
What Unity Exchange says
The publisher blocked the bid due to the advertised app's age rating.
Unity Exchange reports this integer in the ${AUCTION_LOSS} macro on the bid's lurl. A search for Unity RTB error 1003 is this code.
What to change
The advertised app's age rating is above the publisher's maximum. Stop bidding that app on this inventory.