Im not sure.
I can open the website but my friends see the same error like you do. I have cleared cache and cookies and still it loads on my phone but not on my friends phone.
I never had https before cloudflare. What do you think I can do to fix it?
I received name servers but GoDaddy asks for IP address to apply custom name server.
I used https://toolbox.googleapps.com/apps/dig/#A/ and added nameserver and got an IP address. I added those IP address to Godaddy as I was not able to find any IP address with your name servers.