New subdomain is giving a 526 error

I have a Cloudflare Universal SSL certificate that covers * as well as It is set to “Full”.

I am trying to set up a subdomain so that I can use Apollo for email. The subdomain will be “mail” and the CNAME will point to

However, even after I create the CNAME record in Cloudflare, Apollo cannot find that record. I’ve tried going to and it gives me a 526 error. How can I get this to work?

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