XF 1.2 Confirmation Emails show my IP not my domain name

When a user registers for my site and they receive a confirmation email, the link says "000.00.00.000/xxx/xxx/xxxx" instead of something like "mydomain.tld/xxx/xxxxx/xxx"

I know it's not too big of a deal, but it just looks sloppy. How can I fix this?
 
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