I tried to transfer a .co domain to Cloudflare and dashboard said it is a premium domain that is not supported by Cloudflare. However, if I try to register any random .co domain on Cloudflare it says it is supported and says it will be $24/year.
I’d like to know whether Cloudflare supports .co as I am getting conflicting information between transferring .co domain versus registering .co domain
Welcome to the Cloudflare Community. 
Cloudflare does generally support registration of co domains. Cloudflare does not support registration of any domains that are marked premium by their registry. That status will prevent the transfer or registration of a domain that is in an otherwise valid TLD.
You can view the list of currently supported TLDs here:
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