SIMULATION -
The developers at your company plan to publish an app named App12345678 to Azure.
You need to ensure that the app is registered to Azure Active Directory (Azure AD). The registration must use the sign-on URLs of https://app.contoso.com.
To complete this task, sign in to the Azure portal and modify the Azure resources.

Suggested Answer: See the explanation below.
Step 1: Register the Application
1. Sign in to your Azure Account through the Azure portal.
2. Select Azure Active Directory.
3. Select App registrations.
4. Select New registration.
5. Name the application App12345678. Select a supported account type, which determines who can use the application. Under Redirect URI, select Web for the type of application you want to create. Enter the URI: https://app.contoso.com , where the access token is sent to.

6. Click Register
Reference:
https://docs.microsoft.com/en-us/azure/active-directory/develop/howto-create-service-principal-portal