I have recently purchased (additional) Jira Service Desk Licences and three separate Plugin Licences (for JSD), via our corporate purchasing partner.
The Jira Service Desk licences have been assigned to our current SEN taken from our existing JSD deployment (let's call this SEN-111222) which was provided to our corporate purchasing provider when placing the order. There are no problems with these new JSD licences.
The Plugin licences have been purchased, but assigned to completely *new* SEN numbers (let's say SEN-222123, SEN-222124 and SEN-222125).
Question - would new plugins create new SEN Numbers (as per the behaviour we have seen) or should I expect these plugin licences to be assigned to our original JSD SEN number (SEN-111222)?