"Not many days after the victory, Licinius, having received part of the soldiers of Daia into his service, and properly distributed them, transported his army into Bithynia, and having made his entry into Nicomedia, he returned thanks to God, through whose aid he had ovecome; on the ides of June [June 13th], while he and Constantine were consuls for the third time, he commanded the following edict for the restoration of the Church, directed to the president of the province, to be promulgated:"
At the end of the chapter it says, "Licinius having issued this ordinance, made an harangue, in which he exhorted the Christians to rebuild their religious edifices."
So, yes, they did meet in Milan, but the edict was issued later in Nicomedia by Licinius after his victory over Maximin Daia.