0 Unknown Error 1 Technical Error 2 Invalid Request 3 Known Web Spider 4 Suspected Non-Human Traffic 5 Cloud, Data center, or Proxy IP 6 Unsupported Device 7 Blocked Publisher or Site 8 Unmatched User 9 Daily Reader Cap Met 10 Daily Domain Cap Met 11 Ads.txt Authorization Unavailable 12 Ads.txt Authorization Violation 13 Ads.cert Authentication Unavailable 14 Ads.cert Authentication Violation 15 Insufficient Auction Time 16 Incomplete SupplyChain 17 Blocked SupplyChain Node 5000 Missing Secure Signal 5001 Invalid Secure Signal 5010 Missing Ad Unit Mapping 5011 Invalid Ad Unit Mapping 5020 Unsupported GMA SDK Version 5021 Unsupported 3P SDK Version 5022 Unsupported 3P Adapter Version 5030 NPA Mode Enabled 5040 No known Deal ID 5050 Direct payment is not supported 5051 Google payment is not supported