3GPP 23.501 v20.2.0 — the document's own text

5.9.5 AMF Name

Taught in 7. Every name the system uses (The 5G system architecture, in depth), 4. Knowing who you are and where you are (The 5G system architecture, overview).

An AMF is identified by an AMF Name. AMF Name is a globally unique FQDN, the structure of AMF Name FQDN is defined in TS 23.003 [19]. An AMF can be configured with one or more GUAMIs. At a given time, GUAMI with distinct AMF Pointer value is associated to one AMF name only.