Aether Addic

Is 101bestdrone.com domain under your control?

Furthermore, you have some other domain which you would like to use as a CNAME setup over that sub-domain cdn? (to load content of this cdn on some other sub.exampleB.com domain?

Regarding the sub-domain possible issues, see below:

May I ask what are you trying to achieve for better understanding?

Yes, it should.
Regarding correct SSL settings, kindly see below article:

Here is a way to re-check if you correctly setup the SSL for your domain with Cloudflare:

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