Hi Lei, I would recommend reviewing the Amazon Cognito and AWS SDK for .NET Developer Guides if you haven't already, as there are sections on multi-tenancy and examples that may help answer your questions. There is also an AWS Security blog post about setting up Amazon Cognito for federated authentication using Azure AD.
Additionally, if you can provide more details on the authentication flows/use-case(s) that you're looking to support, someone might be able to give a more detailed answer. Hope that helps!
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