Does domain mapping work with WP MultiSite/sub-directories and Cloudflare

I have WP MultiSite with sub-directories installed. I am also using cloudflare. When I try to map a domain I get a default apache page instead of the site I have it mapped to. is mapped to

I have tried to search for answers but everything seems to be about sub-domains. Is there any guidance on sub-directories?

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Mike Catellier