Playing cup and quali with friends

Hi all, sorry if the topic has been already discussed but I couldn’t find any answer. 
I used to play online cup and quali for WL with a friend for many years. Like I mean checking that I was matching with him before starting the match and then giving each other the W. This year’s been extremely difficult, almost impossible to match with each other. Is anybody doing the same? Does anybody know if there’s a kind of a ban that doesn’t allow you to match with several profiles? Thanks.