Pure mapping of a provisioning request to the Graph create-mailbox payload. Derives the
MailNickname from the local part of the requested address. Throws when no RequestedValue is
supplied — a Graph mailbox must be created at a known address (Graph does not allocate one).
Pure mapping of a provisioning request to the Graph create-mailbox payload. Derives the
MailNicknamefrom the local part of the requested address. Throws when noRequestedValueis supplied — a Graph mailbox must be created at a known address (Graph does not allocate one).