From start of FIFA 20 a lot of сlubs have a problem with drops in season/friendly matchmaking. Some players not able to load into "select kits" lobby when opponent already was find. When all others players succesfull loaded into this lobby, those players in same time receives an error and returns into pre-game lobby. Thats always the same people, most often there are three of them per team. We could not find any patterns, be it provider/region, position or anything else. But it happens at all clubs.
P.S. This happens on both PC and PS4.