openrtb.2.3.1.macro.auction_bid_id

What it means

OpenRTB 2.3.1 introduced macro.${AUCTION_BID_ID}, which openRTB 2.3.1 corrected the ${AUCTION_BID_ID} substitution target to BidResponse.bidid..

Why it matters

macro.${AUCTION_BID_ID} is only defined from 2.3.1 onward. Used against an earlier version it is not valid, and a consumer below 2.3.1 treats it as an unknown field.

How to fix it

Target OpenRTB 2.3.1 or later when you send macro.${AUCTION_BID_ID}, and make sure the value matches the type and any enum the specification defines for it.

Paste your bid request into the tester and select OpenRTB 2.3.1 to see whether this rule fires against your payload.

Reference

• Specification section: Section 4.4 typo fix
• Source: IAB Tech Lab OpenRTB standards page

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