Same issue here. Purchased a HoTN founders pack, and when I click on the link it says completed like it did when I purchased it. Yet it just goes through login process and then disconnects me from login server. Submitted a ticket but it will take days to resolve it suggests.
Got up 3am in the morning to try this out, but same issue.....my HoTN founders account is not getting early access as I keep getting disconnected from the login server as well.