Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Well, there's another way and it's quite easy. I use it myself. The registrar of my domain offers email service. I've configured that mailbox to forward all the mail to my Outlook.com mailbox. I've also added my personal domain address as an alias to my Outlook.com mailbox so I can send mail from the alias address. I've set the default from address to be by personal address. I've never had any trouble with this arrangement.