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C. Praveen kumarC. Praveen kumar 

Your authentication token to this content source has expired - Files Connect Sharepoint

Hi,

I have configured Auth. Provider and External Data Sources for Sharepoint in my Sandbox Instance.

I am able to Validate/Authenticate Client's Sharepoint Instance, But I am facing an issue with connecting Sharepoint cia Files Tab

Your authentication token to this content source has expired

Refering the following link : https://help.salesforce.com/apex/HTViewSolution?urlname=Files-Connect-OAuth-issue-Your-authentication-token-to-this-content-source-has-expired&language=en_US

I tried to recreate Authentication Settings for External Systems, still the problem persisting. 

Please advise.

Thanks & Regards,
Praveenkumar