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5GS – General Registration – 14 of 24
Signalling flow for TS 23.502 General Register - UDM selection

Step 13, verbatim
If step 14 is to be performed, the new AMF, based on the SUPI, selects a UDM, then UDM may select a UDR instance. See TS 23.501 [2], clause 6.3.9.
The AMF selects a UDM as described in TS 23.501 [2], clause 6.3.8.