RTBlintAlpha
Loss notice URL has no ${AUCTION_LOSS}
lurl is present without ${AUCTION_LOSS}, so the notice cannot report why the bid lost.
What it means
lurl is the loss-notification URL. ${AUCTION_LOSS} expands to the OpenRTB loss reason code. An lurl without that macro is just a ping.
Why it matters
Loss reason codes are how a DSP learns that the bid was below floor, filtered, or beaten. Without the macro the URL is traffic with no signal.
How to fix it
Add ${AUCTION_LOSS} to lurl. Keep ${AUCTION_PRICE} on nurl/burl; that is a different notice.
Example that trips it
{ "lurl": "https://dsp.example/loss" }Check your payload
Paste a bid request or response into the tester to see whether this code fires against it, or gate on the id in CI with the CLI: the id is stable, wording is not.
Back to the full diagnostic code reference.