The repayment relates to profits shared by partners at the agency in the year before its collapse.
According to a report in The Times, BDO conducted a rigorous investigation into the Bell Pottinger partnership deeds to increase the amount owed to creditors.
Bell Pottinger was kicked out of the PRCA in September 2017 after it was found to have breached its professional charter and its public affairs and lobbying code of conduct in its work for Oakbay Investment, a South African conglomerate whose owning family has close links to the country's president.
Recently, PRCA director general Francis Ingham told PRWeek that he had received several threats of intimidation and violence during the process.
The scandal led to a flight of clients, including HSBC, Clydesdale Bank, TalkTalk and Carillion, as well as its CEO James Henderson resigning before the agency collapsed on 12 September.
BDO, which was appointed administrator, had not responded to PRWeek’s approach for further details on the liquidator’s letter at the time this article was published.