Approval - Access denied

Hi Team. 

So, we have an approval workflow. The user who needs to approve the request receives the email, opens the WI, and clicks on Approval. They see the item that needs to be approved. 

When they click approve, they will see Access Denied. I didn't think any permissions needed to be set here, but I'm happy to stand corrected. 

I appreciate any help you can provide. 

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