VAST-3.0-companion-required-attr
<CompanionAds> required attribute must be all, any, or none
WarningValuesIAB VAST 3.0 §2.4.2VAST 3.0, 4.0, 4.1, 4.2, and 4.3
The `required` attribute on `<CompanionAds>` tells the player how strictly to enforce companion delivery. It must be `all`, `any`, or `none`.
How to fix
Set the required attribute on <CompanionAds> to all, any, or none.
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