This site can’t provide a secure connection

This site can’t provide a secure connection uses an unsupported protocol.

Can somebody please help me out, I am in a great trouble.!

So I bought a free domain from named

I wanted to add a secure connection to it and thought of using Cloudflare. So I added my domain to Cloudflare and changed the nameservers in freenom to Cloudflare’s nameservers. And it said Cloudflare is now active and protecting my domain. I also added (glitch’s CNAME) to Cloudflare’s DNS record! But whenever I go to my domain, I am getting an error mentioned above in the heading! Could somebody please guide me out, I am very very new to Cloudflare and domain technology.

Note: Idk how actually, but one time I reload my domain, it showed me my website with certificate activated, and when I reload again it says same error.

Was it providing a secure connection before you added it to Cloudflare?