Unable to use my domain name in Office 365 as it's already being used in Azure

Arman Avetisyan 0 Reputation points

I've purchased a domain name from GoDaddy and started using it in Azure Web App Service. Now I'm trying to use it in Office 365 Business to create emails with my domain but it says that the domain is already being used by another service.

Also, I don't feel confident about deleting that domain from my Azure services as it might take down my app server.

Any suggestions on how can I fix this?Screen Shot 2023-12-03 at 11.04.41

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  1. brtrach-MSFT 15,791 Reputation points Microsoft Employee

    @Arman Avetisyan Here are the steps you can follow:

    1. Sign up using an admin user in your company.onmicrosoft.com tenant: This will ensure that the Azure AD is shared between your Azure subscription and your Office 365 subscription. This is a standard practice.
    2. Check the Azure portal and Office 365 setup: You can verify this by checking the Azure portal section Azure Active Directory > Custom domain names AND in Office 365 > Admin > Setup > Domains. You should see the same domains configured in both interfaces.

    Two Azure Active Directories cannot have the same domain. Technically, an Office 365 instance with a tenant name (.onmicrosoft.com) is an Azure AD. Office 365 is just a SaaS application attached to every Azure AD. So, if you have a domain abc.com under a tenant - contoso.onmicrosoft.com (doesn’t matter whether it’s in Office 365), you can view this directory in the Azure Classic portal.

    Please note that you should not delete the domain from your Azure services as it might disrupt your app server. Instead, you should try to integrate the domain with both Azure and Office 365.

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