openrtb.2.6-202309.bidrequest.acat

What it means

OpenRTB 2.6-202309 introduced bidrequest.acat, which openRTB 2.6-202309 added allowed advertiser categories on the bid request..

Why it matters

bidrequest.acat is only defined from 2.6-202309 onward. Used against an earlier version it is not valid, and a consumer below 2.6-202309 treats it as an unknown field.

How to fix it

Target OpenRTB 2.6-202309 or later when you send bidrequest.acat, 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 2.6-202309 to see whether this rule fires against your payload.

Reference

• Specification section: Section 3.2.1
• Source: GitHub release notes: 2.6-202309

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