Custom Hostname - Issue with Apex CNAME

I'm trying to set up a custom hostname from one of my other apex domains outside of Cloudflare into my one inside of it, and despite having the apex domain pointed towards the CNAME (flattened) and the returned IPs being the same as the custom hostname, it's saying it's using cloudflare and can't be activated and sometimes even that it isn't pointed towards it, which it is, is there any way to fix this?
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