Origin Certificate for TLS setup for 2nd level subdomains

I am serving multiple subdomains: a.b.domain.com.
b.domain.com is accessible. however for a.b.domain.com I get “Please contact your hosting provider to ensure that an up-to-date and valid SSL certificate issued by a Certificate Authority is configured for this domain name on the origin server.”

If I understand the error correctly, its about the origin server certificate. I understand that the default certificate only works for one subdomain, so I created a dedicated one that covers b.domain.com and *.b.domain.com and installed that on the server. I am confused as to why its working for b.domain.com but not for a.b.domain.com. I have Total TLS enabled so edge certificates are taken care of.

I had to append the Cloudflare Origin CA root certificate…

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