Selling dongle on to third party after purchase!

What Mike said… and to follow up, Steinberg actually provides an online “Wizard” you can use to make sure it works smoothly. it’s at https://www.steinberg.net/en/support/knowledgebase_new/free_articles/kb_show/resale-wizard-for-steinberg-software

If the link doesn’t work you can just google steinberg resale wizard