Approval Workflow Not Accepting Approved or Denied from one user

I have an approval workflow and it will not accept results from one user. It works for other users.
Answers
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Are you using Approval automations or having them go into the sheet/report/Dynamic View to approve it directly?
If using automations, have you checked the security setting for automations on that sheet? Open Automations, then click the gear icon. It may be that your user isn't in your account or shared to the sheet, and the automation security is on Restricted.
It's also possible that your System Admin has restricted notifications/requests to only users shared to the sheet, or only shared to sheet+in your account (meaning, no external users/vendors/customers).
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I am using approval automations. Only this user is having an issue. Security settings are unrestricted.