Get File from Sharepoint - "Access Token Not found" appears only in Scheduled flows

[Pksilvia]

Hi all,

I created an scheduled flow that creates a file from a Sharepoint folder and sends it as an attachment via email (Outlook).

It is strange because when I manually execute or test the flow, the flow works, but when I leave the flow to execute as per scheduled, it appears the "Access Token Not Found - Unauthorised" error.

Any idea on why this happens? Is there any way to fix it?

Thanks a lot in advance for your help.