Domain alias in cloudflare

Hi, I’m having trouble adding an alias. I had abcd.com and abcd.co.uk. I’m planning on sending users there based on their language. so I add both domains to Cloudflare, changed the nameserver, and added CNAME in abcd.co.uk that points to abcd.com. both IP addresses are pointing to the same IP and I also add an alias domain in the Cpanel. but my .co.uk is giving connection time out.
what did I miss?,
Thanks

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