
There is no REST API or export to excel method to export the Power Automate Approval History. There is a request below and you can vote for it.
https://powerusers.microsoft.com/t5/Power-Automate-Ideas/Export-approval-history/idi-p/291116
Workaround: In your flow, you can capture information after the approval action is completed such as all the details of the user, out come, date & time, comments and other details. You can write this information into a SharePoint list or SQL table or CDS. These systems provides various ways to access the content.
Please let me know if you have any more questions.
Regards
Krishna Rachakonda
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