Referees' chief Howard Webb says West Ham should not have been awarded a penalty during Erik ten Hag's final game in charge of Manchester United on 27 October.
The Hammers were given the decision on the recommendation of video assistant referee Michael Oliver following Matthijs de Ligt's challenge on Danny Ings.
David Coote, the on-field referee, had waved play on following the incident but awarded a penalty after reviewing the incident on the pitch-side monitor.
Jarrod Bowen scored the penalty, sealing a 2-1 win for West Ham. Ten Hag was sacked less than 24 hours later.