Need to understand how customers can set their CNAME point to my site

What is the name of the domain?

simplyuptime.co

What is the issue you’re encountering

Need to understand how customers can set their CNAME point to my site

What steps have you taken to resolve the issue?

I allow customers to have their own subdomains which works now:
Example: chicken.simplyuptime.co, ninjapipe.simplyuptime.co (You can actually try visiting these to get an idea)

And I purchased Cloudflare Custom hostnames to also allow customers to use their own domains that point to their unique URL above. So what instruction do I need to provide my customers in order to assign their own domain?

Example scenario:
Customer’s unique URL on my SaaS: chicken.simplyuptime.co
Customer’s own domain they wish to connect: uptime.groopie.co

I tried adding a CNAME record to a test domain I own (groopie.co) as:

CNAMEuptime.groopie.cochicken.simplyuptime.co

But when I do that, my server struggles to find this. How do I make it easy for my customers to simply add a CNAME with their domain that points to the unique address I provide to them? Can you help me figure this out please as I think I’m missing something here.

Screenshot of the error

Going to uptime.groopie.co I get a 404.

Cloudflare will pass uptime.groopie.co as the host header so you need to ensure your origin is configured to answer for your customer’s hostname.

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