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.

successbusinesspro.com/testsite/ is mapped to successwebhosting.net

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