openrtb.2.0.user.data

What it means

OpenRTB 2.0 introduced user.data, which openRTB 2.0 expanded support for third-party audience data segments..

Why it matters

user.data is only defined from 2.0 onward. Used against an earlier version it is not valid, and a consumer below 2.0 treats it as an unknown field.

How to fix it

Target OpenRTB 2.0 or later when you send user.data, 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 2.0 to see whether this rule fires against your payload.

Reference

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

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