RTBlintAlpha
nbr 16: Incomplete SupplyChain
What it means
The SupplyChain object is missing nodes (complete != 1).
A bidder returns nbr on an otherwise empty BidResponse to say why it is not bidding, instead of (or alongside) an HTTP 204. Code 16 is incomplete supplychain.
What to do about it
The SupplyChain object failed the bidder's policy: incomplete chains (complete != 1) or a blocked intermediary node. Validate the schain you send; duplicate nodes, missing hp flags, and empty identifiers all make a chain unverifiable.