VAST-4.0-universaladid-idvalue
VAST-4.0-universaladid-idvalue
<UniversalAdId> missing required idValue attribute (VAST 4.0)
ErrorRequired fieldsIAB VAST 4.0 §2.3.4VAST 4.0, 4.1, 4.2, and 4.3
Short answer
In VAST 4.0 specifically, the ad identifier was stored in an idValue attribute on <UniversalAdId>. This was changed in 4.1 to use element text content instead.
Why this matters in production
This rule is usually a delivery blocker. Many players, SDKs, and ad servers will discard the response or skip the affected creative once this condition is hit. Required-field failures usually stop validation early because the platform cannot determine the basic shape of the ad, the creative metadata, or the mandatory tracking payload. Affected scope: VAST 4.0, 4.1, 4.2, and 4.3.
How to fix
Add idValue="YOUR_AD_ID" to <UniversalAdId> — in VAST 4.0 the identifier is stored as an attribute, not element text.
Check your VAST tag for
VAST-4.0-universaladid-idvalue and other issues instantly.Open the VAST tag validator →Other Required fields rules
VAST-2.0-root-elementRoot element must be <VAST>VAST-2.0-root-version<VAST> must have a version attributeVAST-2.0-root-version-valueVAST version attribute must be a recognised version stringVAST-4.0-wrapper-root-error<VAST> root contains both <Ad> and <Error> elements (invalid per VAST 4.0)VAST-2.0-ad-has-inline-or-wrapperEach <Ad> must contain exactly one <InLine> or <Wrapper>VAST-2.0-inline-adsystem<InLine> must contain <AdSystem>VAST-2.0-inline-adtitle<InLine> must contain <AdTitle>VAST-2.0-inline-impression<InLine> must contain at least one <Impression>