An Administrator user has the ability to resend approval emails if required.
Login to DPF, go to the relevant module, and find the transaction/s that you want to resend the approval email for.
On the right-hand side, click the 3-dot menu icon to bring up the Approvals.
The current approver will be highlighted in green, and there is a Send Email button that can be clicked to resend the email.
If your production does not have an Administrator setup, please log a ticket with TPH Support by emailing support@helpdesk.tphglobal.com with the transactions that you would like the emails resent for, and the Support Team can take care of this for you.