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No bids
Walk from "is the auction even running" down to the specific reason a bidder returns nothing: consent gating, an authorization gap in ads.txt, a floor set above live demand, or a misconfigured adapter.
Step 1
Is the Prebid auction actually running for this ad unit?
What to check
In the browser console run pbjs.getEvents() or watch the network tab for adapter requests. Confirm requestBids fired and the ad unit code is present in pbjs.adUnits. If no requests leave the page at all, the auction never started.
What did you find?