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You can absolutely set up a custom domain in Microsoft 365 so that your email addresses use your own domain instead of the default yourdomain.onmicrosoft.com.
Please note that adding, modifying, or removing domains requires Global Administrator or Domain Name Administrator permissions. These changes apply to the entire tenant, so regular users cannot perform them.
To add a custom domain:
-Sign in at https://admin.microsoft.com with your admin credentials
-Follow the guided steps (or watch the video) in this official article: Add a domain to Microsoft 365 - Microsoft 365 admin | Microsoft Learn.
After you verify your domain (Microsoft recommends using a TXT record for this step), update the required DNS records as instructed and assign the new domain to users or set it as the default for new accounts, as mentioned in the article Add DNS records to connect your domain - Microsoft 365 admin | Microsoft Learn.
Domain setup can feel technical, but the admin center walks you through it step by step, and the linked guide is very straightforward. Once completed, you’ll be able to use your own domain across Microsoft 365 services, giving your organization a more professional and consistent identity.
I hope this makes the process clearer and easier for you.
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