# Should I create my own Azure Application Registration? (Custom Identity Provider)

By default you will have a 'Shared' Microsoft Identity Provider enabled. This allows anyone to sign in with any Microsoft account: Azure, Office 365, Outlook.com, etc. This is useful for 3rd parties, vendors, etc.
If you wish to force your users to sign in with your [own](/anyx-guide/sign-in-with-microsoft/) Azure tenant (e.g. to enable auto-create), you may [create](/anyx-guide/authentication-issuer/) a 'Custom Authentication Issuer'.