Hello, I setup a few websites for a client, under my own octobercms.com account. Now I want to transfer / bind these websites to the octobercms.com account of this client, where I created an identical project. How do I switch the website to the License Key of this project in the other account? (so it effectively changes the owner as displayed at the top of the Updates & Plugins page)

Hi, you can set a license key with composer by running php artisan project:set <license key>. https://octobercms.com/docs/setup/deployment#auth-file