How do we ensure that the Approver can approve a request that was initially denied?

The request ticket contains an exchange of conversation between the requester, 3rd-party group, and the Approver. The technician initially sent an approval request, however, the requester was looking for additional information - so the Approver denied the request until all information was provided.

The requester provided all the information, then the technician sent another approval. However, the approver cannot approve it on the second attempt.