REST API invoke request failed - The ApplicationAccessKey in the HTTP header did not match

I found an app online that has an approve/reject automation I’d like to leverage for another app I’m using. I copied the app and modified the HTML code in the tried testing it out but I’m getting an error REST API invoke request failed - Row having key [value] not found.

The automation process is basically, when a new submission is created, send an email to the assigned approver.

The email body is an HTML that contains the accept and reject buttons:

Request for <<[Name]>>
<<[Description]>>

this is what it creates:

I will send the submission to myself, click approve and another screen will pop up saying REST API invoke request failed - The ApplicationAccessKey in the HTTP header did not match. What could I be missing?

Were you able to resolve this problem?

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