Banned for Multiple Accounts

[MediaAccessControl]

I made an OwnedCore account a few hours ago, then after about an hour or two received a message that I'd been banned for having multiple accounts, which confused me. I went digging in an old email account and found that I made an account a few years ago, which I had totally forgotten about.

I have no issue with this rule -- I'm just confused as to how it happened. Maybe I had an old cookie linked to my previous account?

What I can do to avoid this happening again? I won't be making anymore accounts, I only need one, haha.

[KuRIoS]

Easier if you give the names of the accts