How to refresh an expired SharePoint client secret
Any Client ID (or App ID) and client secret registered through SharePoint Online’s /_layouts/15/AppRegNew.aspx has a validity of 1 year.
Kindly read more about how to renew the client secret manually: https://www.sharepointdiary.com/2020/12/how-to-renew-a-client-secret-in-sharepoint-online-using-powershell.html#ixzz8sD13AfeE
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