It sounds like you may have signed up using a different email (or potentially mistyped your email when signing up). One option to figure it out is to search your mail application for emails from HipChat and see what email they're addressed to.
If you continue to have problems, I'd suggest you contact support by going to https://support.atlassian.com/servicedesk/customer/portal/32. They should be able to help you figure out your issue. Having the name of the subdomain you created when signing up will also help them narrow things down for you.
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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