couldn't add appwrite subdomain

my current console/server domain is cloud.xxx.xxx. I wanted to add appwrite.xxx.xxx as custom domain yet failed. It says it's verified yet no domain added to custom domain. Urgent help needed. I need custom domain for functions since Stripe webhook doesn't allow custom header

pic for ref. Btw I'm using custom Nginx for reverse proxy since I need to use custom SSL cert.

TL;DR

The user is having trouble adding an Appwrite subdomain. They have tried configuring DNS settings and Nginx, disabling the proxy in Cloudflare, and using the values appwrite.xxx.xxx for _APP_DOMAIN, _APP_DOMAIN_TARGET, and _APP_DOMAIN_FUNCTIONS. They have a custom Nginx for reverse proxy and need a custom SSL cert. They need urgent help as they require a custom domain for functions due to Stripe webhook not allowing custom headers. No solution is provided in the thread.

CNAME ref