We’ve had a couple of situations recently where our Nintex approval emails have gone AWOL and never made it to their intended recipient. Because these approvals can relate to some important and time sensitive activities, its important to keep the approval mechanism running smoothly.
I’m not a Nintex expert but as far as I could tell there is no built in way to resend the approval request email. As a slight workaround however, you can use the Delegate feature shown below to resend the email by “delegating” the workflow task to the user that already owns it.
Note there is no need to delegate the workflow task to yourself and then back to the intended approver.