I’m having the same issue myself any fix found i just keep restarting whilst internet connection where i live isn’t great it by no means should be the deciding factor in whether i can play this appears to be a hi rez issue
I’ve found a way around it kinda but its horrible , while connected to a vpn (game is banned here iam) i connect to my mobile data before attempting to login , after im in the lobby i connect back to ethernet , one problem with it tough after every match finishes i get disconnected and reconnected within 30-80 seconds of finishing and then reconnecting , and during that time i can kinda do everything , queue manage party use partychat/match chat etc , but its mostly buggy and i lose the ability to type in chat after like 10-20seconds of ending that match