This sounds like either a mis-entered email or temporary issue with communication between HipChat and your email server. You can try going to https://www.hipchat.com/forgot_password to re-send the confirmation email. If the issue continues, I'd recommend dropping our support team an email via email@example.com. They should be able to more accurately diagnose the reason you might not be getting a confirmation email.
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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