What happens if the User Identity in the data read request does not exist in the HSS?
Experimental-Result-Code is set to DIAMETER_ERROR_USER_DATA_CANNOT_BE_READ in the Sh-Pull Response
Experimental-Result is set to DIAMETER_ERROR_USER_UNKNOWN in the Sh-Pull Response
Experimental-Result-Code is set to DIAMETER_ERROR_IDENTITIES_DONT_MATCH
Experimental-Result is set to DIAMETER_ERROR_OPERATION_NOT_ALLOWED in the Sh-Pull Response