3GPP 23.501 v20.2.0 — the document's own text
6.3.15 UCMF Discovery and Selection
Taught in 6. How one function finds another (The 5G system architecture, in depth).
The AMF, MME, NEF, AF, SCEF, SCS/AS may utilize the NRF to discover UCMF instance(s) unless UCMF information is available by other means, e.g. locally configured in UCMF services consumers.
In the case of delegated discovery and selection in SCP, the NF consumer shall forward the request towards SCP.