openrtb.2.1.enum.content_category.tier2

What it means

OpenRTB 2.1 introduced enum.content_category.tier2, which openRTB 2.1 added support for IAB Tier-2 content categories..

Why it matters

enum.content_category.tier2 is only defined from 2.1 onward. Used against an earlier version it is not valid, and a consumer below 2.1 treats it as an unknown field.

How to fix it

Target OpenRTB 2.1 or later when you send enum.content_category.tier2, 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 2.1 to see whether this rule fires against your payload.

Reference

• Specification section: Release highlights
• Source: IAB Tech Lab OpenRTB standards page

Back to the full rule catalog.