Voucher Approval Workflow - Escalations/Worklist

Hi All,

Thanks in advance for your help.

We are using voucher workflow approvals in which after a period of time/inaction by an approver will be routed to a role with multiple users to approve. Within this role, a user is receiving the email notification, but cannot take action to approve/deny the related voucher. 

Any idea what would be precluding the individual from taking action on an approval?

Thank you,

CM