Security issues connecting Landing Page to custom domain

Security issues connecting Landing Page to custom domain, as far as I can tell I have set everything correctly in Convert Kit for my Landing Page to be set up as custom domain. My Word Press site has the DNS codes added, however it does not point to the CK landing page - I get a security error message, any ideas what I need to do please? (newbie here) I want landing page to be the main high level domain ( a holding page while the website is built)

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