The Pilgrims led 2-0 after 87 minutes in the northeast on November 10 when home defender Nicky Hunt sustained a serious injury.
United put forward what they believed to be a strong case to be awarded all three points, particularly in a Covid-19-condensed season, but the National League board deemed that a full rematch will be required.
United are disappointed with the outcome and did consider an appeal, but given the detailed submissions already made, it was felt the decision would not be overturned.
The Pilgrims will therefore visit Blackwell Meadows on Tuesday February 16 (kick-off 7.45pm).