I have one client for which Quickbooks Online is not automatically matching checks that cleared the bank to checks in Quickbooks. I have to manually match each check, which is a time suck. I've contacted Quickbooks support in the past and the person I talked to couldn't figure out the problem and said there wasn't anything they could do. I'm going to contact support again today to see if I can get someone who can actually help, but thought I'd try the community too in case they can't help.