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Previously, we successfully authenticated using Ocp-Apim-Subscription-Key. However, as of two days ago, we are receiving the error message: "User(C2) connections must use Azure Active Directory."
To resolve this, we've implemented the following:
Created an app registration in Azure Active Directory.
Configured Access Control in Azure API Management to utilize this app registration.
Re-added the REST API in Copilot Studio, configuring its authentication type as OAuth 2.0.
Despite these steps, the connection continues to fail. We would appreciate your assistance in troubleshooting this issue.