This feature is available with some paid plans
Emoji domains can't be used as your custom domain or in a custom back-half.
You can shorten websites that use emoji domains, but we'll translate the emoji into Punycode. For example: i❤️tacos.ws will appear as http://xn--itacos-i50d.ws in the destination field on the link-shortening page. That's also how it will appear on your Links page.