moving a domain from one Microsoft 365 tenant to another

As the title says - to move a domain from one Microsoft 365 tenant to another, since I did not have any data to be backed up, I just deleted all the users, then deleted the domain, and recreated the domain in the other tenant. In order to delete the domain in the admin centre at admin.microsoft.com I had to first create an admin user myusername@mydomain.onmicrosoft.com , log in as that user, and then delete the other existing admin user adminuser@mydomain.tld. Only then is the domain deletion permitted.