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5GS – General Registration – 04 of 24
Signalling flow for TS 23.502 General Register: Registration Request received by AMF

Step 3, verbatim
(R)AN to new AMF: N2 message (N2 parameters, RM-NAS Registration Request (Registration type, SUPI or 5G‑GUTI, last visited TAI (if available), Security parameters, Requested NSSAI, Mapping Of Requested NSSAI, UE 5GC Capability, PDU Session status, PDU Session(s) to be re-activated, Follow on request, and MICO mode preference)).
When NG-RAN is used, the N2 parameters include the Selected PLMN ID, Location Information, Cell Identity and the RAT type related to the cell in which the UE is camping.
When NG-RAN is used, the N2 parameters also include the Establishment cause.
If the Registration type indicated by the UE is Periodic Registration Update, then steps 4 to 17 may be omitted.