Valid Domains in Office 365

You can add multiple domains to Office 365, but each domain should have valid Internet domain suffix such as .com, .net, and .org.

Following are some examples of valid domains:

  • contoso.com
  • contos.co
  • contoso.net
  • contoso.us

Following are some examples of invalid domains and they cannot be added in Office 365:

  • contoso (Single labeled domain is not allowed)
  • contoso.local (Local domain is not allowed)

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