Thanks for reaching out.
There are number of samples provided by Microsoft to integrate various application types with Microsoft Entra ID for customers.
You can find the samples here https://learn.microsoft.com/en-us/azure/active-directory/external-identities/customers/samples-ciam-all?tabs=apptype
You need to register the application in Entra portal as mentioned and can directly download the sample to make minimum configuration in your code to add the application for Sign up flow.
Hope this will help.
Thanks,
Shweta
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