openrtb.2.6-202409.cookie_sync_guidance

What it means

OpenRTB 2.6-202409 introduced appendix.cookie_sync, which openRTB 2.6-202409 added cookie-based ID syncing guidance to the specification..

Why it matters

appendix.cookie_sync is only defined from 2.6-202409 onward. Used against an earlier version it is not valid, and a consumer below 2.6-202409 treats it as an unknown field.

How to fix it

Target OpenRTB 2.6-202409 or later when you send appendix.cookie_sync, 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 2.6-202409 to see whether this rule fires against your payload.

Reference

• Specification section: Appendix C
• Source: GitHub release notes: 2.6-202409

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