Custom Domains with Cloudflare for SaaS - Fastly SSL Error

Hi! I'm using Appwrite Cloud Sites with Cloudflare for SaaS for multi-tenant custom domains.

Problem:

Custom domain: donate.pekeetong.my → CNAME to sites.donorcare.my → sgp.cloud.appwrite.io

Browser: Shows "Not Secure" ❌

How do I whitelist custom domains when SSL is managed by Cloudflare for SaaS?

Have you added your custom domain in the Domain section of your Site?

Failed to add domain to Fastly: {"errors":[{"title":"Invalid value for fqdn","detail":"fqdn Domain name has already been taken"}]}

this error when add, conflict with cloudflare?

im using custom hostname in cloudflare

but now already reach appwrite, routing issue?

Yes this can possibly be the issue

Can Appwrite Sites accept custom domains that CNAME through an intermediary (e.g., donate.pekeetong.my → sites.donorcare.my → sgp.cloud.appwrite.io) for Cloudflare for SaaS compatibility?