Does Cloudflare Access support fourth-level subdomains?

Hello there,
We’re having a use-case where we’d like to protect all *.internal.mydomain.com websites by putting them behind Cloudflare Access.
Is this supported? Right now I think the SSL certificate doesn’t work, and I’m wondering if Cloudflare Access will work.
Best,
Olivier

The free certificate wont work on that level, if you purchase the $10/month dedicated one it will work. Access should equally work without issues.