Page approval flow not working

[Mel_C13]

Hi there

I have configured a page approval on a modern Communications site and the flow appears to create correctly and run properly up to the point that the approval happens.  

But, when it goes to update the page to approved, I get a fail and an error message that says: 

{

  "odata.error": {

    "code": "-2147024891, System.UnauthorizedAccessException",

    "message": {

      "lang": "en-US",

      "value": "Attempted to perform an unauthorized operation."

    }

Here is a screenshot of the flow section that is failing.  

 I used the out of the box configuration so I am not sure what is happening and what I need to update.  

Hopefully someone here can help out.  

Thanks in advance!

[#2]

@Mel_C13 What permissions are granted to flow owner on SharePoint site / site pages library?

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[#3]

Hi Ganesh,
the owners on the flow are also owners on the site collection.