Hi @Phong Bui ,
The reply url in your request is "https://.azurewebsites.net". To resolve this issue, please navigate to Azure AD B2C > App Registrations > Search for the application with the ID of the application in the request > Overview (or Authentication) > add a Redirect URI > update the Redirect URI to "https://.azurewebsites.net". It needs to match exactly what is configured for the application with no extra spaces or slashes.
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