Take for example I have bought my domain example.com at Namecheap.
I than set a custom customer name server in Namecheap because I am using Cloudflare as my authoritative DNS as follows
alpha.ns.cloudflare.com
beta.ns.cloudflare.com
Now my plan is to have DNS high-availability to prevent any DNS outage and ensure the accessibly my web application. I am going use another set of name server from Godaddy namely
ns01.domaincontrol.com
ns02.domaincontrol.com
So can I add these 4 name server record from 2 DNS provider in Namecheap to achieve high-availability ?
alpha.ns.cloudflare.com
beta.ns.cloudflare.com
ns01.domaincontrol.com
ns02.domaincontrol.com
what I have tried is I added these records but in Godaddy it is still showing "This domain is registered elsewhere. To use these DNS records on your domain, set your domain to these nameservers at your registrar:" , only in Cloudflare is active.