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An attempt to authenticate a tenant connection using Veeam Backup for Microsoft 365 REST API fails with an invalid/expired certificate error.
The SSL certificate for the login.microsoftonline.com site has expired in the local certificate store.
To update an expired certificate, do either of the following: Update all current trusted certificates as described in Microsoft Docs. Navigate to the login.microsoftonline.com site in the web browser, download its certificate and install the certificate on the server.
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