openrtb.2.6-202505.data.cids

What it means

OpenRTB 2.6-202505 introduced data.cids, which openRTB 2.6-202505 added extended content identifiers on Data objects..

Why it matters

data.cids is only defined from 2.6-202505 onward. Used against an earlier version it is not valid, and a consumer below 2.6-202505 treats it as an unknown field.

How to fix it

Target OpenRTB 2.6-202505 or later when you send data.cids, 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 2.6-202505 to see whether this rule fires against your payload.

Reference

• Specification section: Section 3.2.21
• Source: GitHub release notes: 2.6-202505

Back to the full rule catalog.