Useful links: Programmatically manage Azure Active Directory (AAD)

How to programmatically create an Azure AD user – https://stackoverflow.com/questions/44756742/how-to-create-azure-ad-user-programmatically

Implement Azure AD B2C – https://docs.microsoft.com/en-us/aspnet/core/security/authentication/azure-ad-b2c?view=aspnetcore-5.0

Microsoft Graph overview – https://docs.microsoft.com/en-us/graph/use-the-api

A Web API that calls other Azure Web APIs – https://docs.microsoft.com/en-us/azure/active-directory/develop/scenario-web-app-call-api-app-configuration?tabs=aspnetcore

A web app that calls web APIs – https://docs.microsoft.com/en-us/azure/active-directory/develop/scenario-web-app-call-api-overview

Implementing sign-in and sign-out – https://docs.microsoft.com/en-us/azure/active-directory/develop/scenario-web-app-sign-user-sign-in?tabs=aspnetcore

User flow sign-up customization using C# .NET Core Azure Function and API connectors – https://github.com/Azure-Samples/active-directory-dotnet-external-identities-api-connector-azure-function-validate