Hi @Kurt Garver
If you are using your own custom domain (example yyyyy.com) you will need to connect your domain to Office 365:
1) You need to sign up for Microsoft 365 Business:
2) Connect your domain to Office 365:
Here is a good video by Russell Smith for Setting Up Your Domain in Office 365 (Microsoft 365)
https://www.youtube.com/watch?v=uV8GRom-_pQ
----------------------------------------------
If this is helpful please accept answer.