Can't add root domain to the Websites

I can’t add EXAMPLE.cloudns.be to the Websites, it says it’s not a root domain.
But it is a root domain, because cloudns.be is on the list of PUBLIC SUFFIX LIST(https://publicsuffix.org).
Any help would be much appreciated!

I think clouddns.be is a recent addition to the PSL, see here…

OK, thanks.
It was added to the list about two weeks ago.

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