Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
As the person wrote.
outlook has launched Outlook Premium in the US, UK and Canada and allows you to use your own domain by paying a small yearly fee. Awesome!
Not in this countries? Try a DNS or an IP.
This is incorrect. Outlook Premium service was recently discontinued for new subscribers. Some of the features were incorporated into Office 365 (ad free outlook for example), however custom domains are not supported.
I was in contact with 4 different support personell until the conclusion was that my custom domain email (I own/control my own domain) would continue to work with outlook.com as long as I had O365. Still not 100% confident as I got a email that told me to renew my premium subscription. I tried to renew the premium sub, but that did not work and I was told it was because I have O365, it was not possible nor necessary to renew.