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We support both apex domains and sub-domains and they have different records. Make sure to indicate if you want it for domain.com or subdomain.domain.com.
You MUST have a Medium publication before enabling your custom domain. If you don't already have a Medium publication, please read this article: https://help.medium.com/hc/en-us/articles/214559417-New-publication
For example Namecheap, GoDaddy, etc.