Subdomain diffirent ip

My domain marydecor.vn point to ip 172.96.191.99 and my subdomain point to ip 112.78.3.29.

After having Cloudflare account, my subdomain is not working.

Not Found

HTTP Error 404. The requested resource is not found.

I set in DNS tab like that:

But everything no change. Pls help me solve it!

It’s working with HTTP, but HTTPS returns a 404. Your other server probably does not have an SSL certificate for that subdomain.

Thanks for your support.

So i will require the domain supplier change form HTTPS to HTTP?
Have anyway to solve this problem?