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5GS – General Registration – 07 of 24
Signalling flow for TS 23.502 General Register - AMF to UE: Identity Request

Step 6, verbatim
[Conditional] new AMF to UE: Identity Request ().
If the SUPI is not provided by the UE nor retrieved from the old AMF the Identity Request procedure is initiated by AMF sending an Identity Request message to the UE requesting the SUCI.