Cannot set custom domain for appwrite functions (with Cloudflare)

I dont really know why but certificates creation failed in Cloud probably because of the CNAME to cloud.appwrite.io Im getting this error when accessing to my customfunction.mydomain.com

TL;DR

Developers are having trouble setting a custom domain for appwrite functions with Cloudflare. The issue might be due to certificate creation failure in Cloud. An error occurs when accessing `customfunction.mydomain.com`.