When you sign up for Office 365 operated by 21Vianet, you’re given an initial domain name that looks like contoso.partner.onmschina.cn. The domain name is part of your user ID, like alan@contoso.partner.onmschina.cn, and you can use the domain to try out Microsoft 365 services. Or, you can use a custom domain name for user IDs, email, and other services.
You can add a custom domain, but you can’t rename the initial domains. For example, if the initial domain you chose during Office 365 signup was fourthcoffee.partner.onmschina.cn, you can’t change it to be fabrikam.partner.onmschina.cn. To use a different partner.onmschina.cn, you’d have to open a new account with Office 365. And, unfortunately, you can't use your custom domain for team site addresses.
Use your own domain in Microsoft 365
To use your own domain with Microsoft 365, instead of the partner.onmschina.cn that you were given at signup, you can add your domain to Microsoft 365 following the steps in the domains setup wizard. After Microsoft 365 confirms that you own the domain, you can use user IDs and email addresses, like like ellen@fabrikam.com instead of ellen@fabrikam.partner.onmschina.cn. Learn more about setting up and managing your domain with Microsoft 365.
You can continue to use your partner.onmschina.cn and public.sharepoint.cn domains if you like, even after you add your own domain name to Microsoft 365, and email still works with your partner.onmschina.cn domain.
Consider the following before you set up your own domain to use with Microsoft 365.
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You must own a domain before you can set it up in Microsoft 365. If you don’t yet own the domain that you want to add, you can register the domain at a domain name registrar.
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You can add a domain with any name that is currently available. The name doesn’t have to match the first part of your partner.onmschina.cn domain. For example, if your partner.onmschina.cn domain was named fourthcoffee.partner.onmschina.cn, you could add a custom domain named fourthcoffee_NW.com.
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You can’t add a domain that you’re already using in another Microsoft cloud service.
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Before you can confirm to Microsoft 365 that you own a domain, you must have the sign-in credentials for your domain registrar or DNS hosting provider. If you don’t remember where your DNS records are hosted, you can learn more about finding your domain registrar or DNS hosting provider.
Need help with a domains issue?
Use a custom domain name for your SharePoint Online public website address
Get the MX record to set up your email on your domain
Find step-by-step instructions for setting up DNS for your domain in Office 365
