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5GS – UE‑Triggered Service Request – 04 of 36
Signalling flow for TS 23.502 UE-Triggered Service Request: NAS authentication/security procedure

Step 3, verbatim
If the Service Request was not sent integrity protected or integrity protection verification failed, the AMF shall initiate NAS authentication/security procedure as defined in clause 4.6.
If the UE in CM-IDLE state triggered the Service Request to establish a signalling connection only, after successful establishment of the signalling connection the UE and the network can exchange NAS signalling and steps 4 to 10 and 13 to 20 are skipped.