Subdomain A record does not point

[user6013]

Hello,
I have setup the primary’s domain name A and CNAME records, and they work properly.
I tried to point the A record of a subdomain to another IP but it does not work. The DNS checkup shows that the subdomain points to Cloudflare ip address 104.24.113.31

My desired structure is as follows
stergioubooks. com A record --> IP address 1 (WORKS)
www CNAME --> stergioubooks.com (WORKS)

erp. stergioubooks. com A record --> IP address 2 (Does not work, points to 104.24.113.31)
www. erp CNAME --> erp. stergioubooks. com (does not work, points to 104.24.113.31)

I have read relevant articles herein and I saw that solutions. However, in my case nothing works.
Any ideas?

Thank you
Leonidas

PS
In the meantime, in order for my site to work, I use another domain to point the IP address 2 from a hosting provider (not cloudflare NS)

PS 2
Disabling the another provider did not solve the problem

PS 3
the main domain (and the subdomain, of course) points to Cloudflare name servers.

[sandro]

Subdomain too deep

This tutorial covers a possible reason for the SSL_ERROR_NO_CYPHER_OVERLAP and ERR_SSL_VERSION_OR_CIPHER_MISMATCH errors (Firefox and Chrome respectively) when seen on a subdomain. The Cloudflare universal certificates cover example.com and *.example.com. This means that it covers any subdomain one level below the domain you signed up with. It will cover www.example.com and subdomain.example.com, as these are one level below the root domain, example.com. The certificate will not cover www.sub…

Though erp.stergioubooks.com should work, the reason why it does not is that you dont have a valid certificate for that hostname on your server, as the error message suggests.

[user6013]

Thank you, so much, Sandro.
I will follow your advice and post the results.
Many thanks again.
Leonidas

[user6013]

Yes, it works.
Million thanks
Leonidas