Nnssf_NSSAIAvailability
This service updates the S-NSSAIs NF service consumer (for example, AMF) on a per TA basis on the NSSF and provides support to subscribe and notify any change in the status on a per TA basis of the SNSSAIs available per TA (unrestricted) and the restricted SNSSAIs per PLMN in that TA in the serving PLMN of the UE.