Configure custom subdomain for ConvertKit landing page

I’m trying to use a subdomain that I’ve added to Netlify, as a “custom domain” for my ConvertKit landing page.

When I try to add the provided DNS records provided by ConvertKit, this is the red error message I get:

dns_api mydomain.com - sub.mydomain.com/A: 400 - link exists, all config must be empty

(I obfuscated the actual domain name values.)

Okay, problem solved:

Turns out I had previously added a domain alias that was I was ALSO trying to add via custom DNS “A” record. Once I removed the alias from the Netlify “Domain management” section, then adding it as a custom “A” record worked.

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