3GPP Scout / Reference / 5GSM causes / 5GSM cause #29

TS 24.5015GSM cause

5GSM cause #29: User authentication or authorization failed

TS 24.501 V20.1.0Clause 9.11.4.2Value 29 (bits 0001 1101)Checked 2026-10-15

In plain words

The network sends this cause when external DN rejects service for failed user authentication, revokes service, or 5GCN rejects for failed user authentication or authorization.

Our summary of the spec text quoted below.

What the spec says

Name in the cause table

User authentication or authorization failed

Source: 3GPP TS 24.501 V20.1.0, clause 9.11.4.2, table 9.11.4.2.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.

When it is used

This 5GSM cause is used by the network to indicate that the requested service was rejected by the external DN due to a failed user authentication, revoked by the external DN, or rejected by 5GCN due to a failed user authentication or authorization.

Source: 3GPP TS 24.501 V20.1.0, clause B.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.

Same cause in EPS (TS 24.301)

TS 24.301 defines the corresponding cause for EPS. Its page quotes the EPS wording.

How this page was made

3GPP Scout built this page from TS 24.501 V20.1.0 as indexed on 2026-10-15. The quotes are copied from the spec, and code checks each one against the stored text and the 3GPP archive file before publishing. The plain-words line was written by an AI model (GPT-6 Sol) and checked against the quotes by a second AI model from another company (Claude Opus 5.5). The official 3GPP text governs.