Cloudflare SSL not working on some mobile devices

I used to work with Cloudflare SSL for mobile app backend.
There was no problem at all. A few days ago, I create a new subdomain and work with SSL for my other app.
It is working fine on most of the devices but some of the mobile devices are not working with the Cloudflare SSL.
I did not know what is the errors and do not know how to solve that.

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