Unable to authenticate with MSAL using a certificate
Hi guys, I'm using the certificate authentication for my WinForms app to connect to SharePoint and Graph API. I followed this article to create the certificate https://learn.microsoft.com/en-us/entra/identity-platform/howto-create-self-signed-certificate Uploaded the certificate to the App Registration, gave all appropriate permissions. However, when I tried to connect to SharePoint or the Graph API, I got this error A configuration issue is preventing authentication - check the error message from the server for details. You can modify the configuration in the application registration portal. See https://aka.ms/msal-net-invalid-client for details. Original exception: AADSTS700021: Client assertion application identifier doesn't match 'client_id' parameter. Review the documentation at https://learn.microsoft.com/entra/identity-platform/certificate-credentials . Microsoft.Graph.ServiceException: Code: generalException Message: An error occurred sending the request. BUT, this only happened on 1 specific machine running Windows 11 Pro. I tested on 4-5 different machines (both W10 and W11), they didn't get this error. I tried verifying the cert thumbprint which matched the one uploaded on the App Registrations. The certificate is not stored in the machine cert store, I use X509KeyStorageFlags.EphemeralKeySet when calling it. Not sure what else to check.