Multitenant Azure AD issuer validation in ASP.NET Core
Read OriginalThis technical article explains a common issue with issuer validation when configuring Azure AD authentication for multitenant applications in ASP.NET Core. It details why tokens fail validation with a wildcard tenant ID and provides a solution using a custom `IssuerValidator` method to securely validate the issuer by matching the tenant ID from the token, avoiding the need to disable validation entirely.
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