VAST-4.1-ad-serving-id-empty: <AdServingId> is present but empty

Q: How do I fix VAST-4.1-ad-serving-id-empty?

Populate ` ` with a unique identifier, such as a UUID generated fresh for every ad response.

Q: What does the VAST error " is present but empty" mean?

` ` is present but contains no text content. An empty serving ID defeats its purpose (event deduplication). Populate it with a unique identifier per ad response.

VAST-4.1-ad-serving-id-empty

<AdServingId> is present but empty

WarningCTVIAB VAST 4.1 §2.3VAST 4.1, 4.2, and 4.3

Short answer

<AdServingId> is present but contains no text content. An empty serving ID defeats its purpose (event deduplication). Populate it with a unique identifier per ad response.

Why this matters in production

This rule is a strong risk signal. Tags with this issue often still parse, but they become brittle across SDKs, SSAI resolvers, and CTV environments. CTV-specific rules matter because connected-TV players are less forgiving than desktop tooling. Wrapper depth, media formats, and measurement integrations tend to fail there first. Affected scope: VAST 4.1, 4.2, and 4.3.

How to fix

Populate <AdServingId> with a unique identifier, such as a UUID generated fresh for every ad response.

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Other CTV rules

VAST-4.1-mezzanine-recommended<MediaFiles> has no <Mezzanine> — may be rejected in CTV/SSAI contexts VAST-4.1-vpaid-in-interactive-contextVPAID MediaFile alongside InteractiveCreativeFile — VPAID unsupported in CTV

VAST-4.1-ad-serving-id-empty

Why this matters in production

Related docs

Other CTV rules