This claim is true.
As part of evidence collected in Dominion's lawsuit against Fox News, executives from Dominion begged the network to stop airing false claims about election fraud.
The article from Mediaite is further supported by this article from NBC news. The NBC article also discusses the significance of Dominion "begging" them to stop airing the falsities as it is unusual for a defamation plaintiff to communicate with the defendant while they are being defamed.