Turn on your parking page from the registrar (this is the best method).
For us, all we needed to do was turn on our registrars parking page, and everything worked like a charm.
In rare cases, the TLD may be brand new, and not on the Public Suffix List (link to the list). The PSL is a list of all (you guessed it) public suffixes. It allows browsers to:
Avoid privacy-damaging "supercookies" being set for high-level domain name suffixes
Highlight the most important part of a domain name in the user interface
Accurately sort history entries by site
Other companies, like Cloudflare, use it to categorize domain names for their system.
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