The "Failed-AVP" AVP

The "Failed-AVP" Diameter AVP, which is of type Grouped, uses the AVP code "279".

It has the MANDATORY flag.

It is part of the Re-Auth-Answer, Session-Termination-Answer, Abort-Session-Answer, Accounting-Answer, Credit-Control-Answer, NAT-Control-Answer, IKEv2-SK-Answer, Capabilities-Exchange-Answer, Disconnect-Peer-Answer, Device-Watchdog-Answer, MIP6-Answer, Diameter-EAP-Answer, Send-Routing-info-for-SM-Answer, Alert-Service-Centre-Answer, Report-SM-Delivery-Status-Answer, MO-Forward-Short-Message-Answer, MT-Forward-Short-Message-Answer, 3GPP-Subscriber-Information-Answer, Configuration-Information-Answer, Reporting-Information-Request, NIDD-Information-Answer, Trigger-Establishment-Answer, 3GPP-Device-Trigger-Answer, 3GPP-Delivery-Report-Answer, NS-Answer, NC-Answer, Non-Aggregated-RUCI-Report-Answer, Aggregated-RUCI-Report-Answer, Modify-Uecontext‑Answer, Data-Update-Answer, Notification-Data-Answer, 3GPP-Device-Action-Answer, 3GPP-Device-Notification-Answer, User-Data-Answer, Profile-Update-Answer, Subscribe-Notifications-Answer, Push-Notification-Answer, Boostrapping-Info-Answer, Event-Notification-Request, AA-Answer, ProSe-Authorization-Answer, Spending-Limit-Answer, Spending-Status-Notification-Answer, Push-Notification-Request, GCS-Action-Answer, GCS-Notification-Answer, ProSe-Subscriber-Information-Answer, Update-ProSe-Subscriber-Data-Answer, ProSe-Notify-Answer, 3GPP-Reset-Answer, ProSe-Discovery-Answer, ProSe-Match-Answer, ProSe-Match-Report-Info-Answer, ProSe-Proximity-Answer, ProSe-Location-Update-Answer, ProSe-Alert-Answer, ProSe-Cancellation-Answer, 3GPP-Provide-Location-Answer, 3GPP-Location-Report-Answer, 3GPP-Update-Location-Answer, 3GPP-Authentication-Information-Answer, 3GPP-Cancel-Location-Answer, 3GPP-Insert-Subscriber-Data-Answer, 3GPP-Delete-Subscriber-Data-Answer, 3GPP-Purge-UE-Answer, 3GPP-Notify-Answer, 3GPP-ME-Identity-Check-Answer, 3GPP-Update-VCSG-Location-Answer, Cancel-VCSG-Location-Answer, Connection-Management-Answer, MO-Data-Answer, MT-Data-Answer, 3GPP-LCS-Routing-Info-Answer, BT-Answer, EC-Answer, ER-Answer, TDF-Session-Answer, TN-Answer, ProSe-Initial-Location-Information-Answer, User-Authorization-Answer, Server-Assignment-Answer, Location-Info-Answer, Multimedia-Authentication-Answer, Registration-Termination-Answer, Push-Profile-Answer, PX-Answer, XA-Answer, Session-Termination-Request commands.

It is a grouped AVP, which can hold the following nested AVPs:

< Failed-AVP > ::= < AVP-Header: 279 > 
* [ Session-Id ]