I'm creating a social app now, confused with Azure AD (B2C)

Roj 1 Reputation point

I'm building a social web app right now.

I purchased app.com domain for it.

I subscribed to Office365 to have a business email address.

When I logged in to Azure, I saw there’s an Azure AD tenant created and tied up to my app.com domain.

But I want an Azure AD B2C so I can have social logins. I can’t create a tenant under B2C because my domain is already used by that AD directory.

From what I read, Azure AD is for handling organization users and B2C is for external customers.
But why do I have to keep separate domains for them.
I only purchased one domain.
If Office365 already used that to create my an Azure AD for my "organization", how can I create a B2C tenant now and allow my customers to sign in using socmed?

PS. deleting Azure AD is not allowed when you have Office 365 subscription

Microsoft Entra External ID
Microsoft Entra External ID
A modern identity solution for securing access to customer, citizen and partner-facing apps and services. It is the converged platform of Azure AD External Identities B2B and B2C. Replaces Azure Active Directory External Identities.
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Microsoft Entra ID
Microsoft Entra ID
A Microsoft Entra identity service that provides identity management and access control capabilities. Replaces Azure Active Directory.
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  1. VipulSparsh-MSFT 16,246 Reputation points Microsoft Employee

    @Roj If you are the real owner for the domain app.com you can perform following options to take over the domain.

    1) Internal Admin takeover
    2) External admin takeover

    Once done, you can use that domain to create Azure AD B2C.