This error might occur in case where your 1st domain let’s say abc.com from which you’re trying to make a Forwarding/301 redirect might be missing an A type of the DNS record
Or you were trying to access via www prefix, therefore this one could be missing while the abc.com is okay.
Kindly, I’d suggest you to double-check your DNS records by navigating to the DNS tab of Cloudflare dashboard for your domain name.
Make sure they are existing, the A www and A abc.com (as an example here) pointed to some IP address and both proxied cloud
Kindly, see the step-by-step instructions from the tutorial below:
Regarding DNS_PROBE_FINISHED_NXDOMAIN error you’re getting, see below article for more information why it happens, how to troubleshoot and solve this issue:
May I ask have you tried using a different Web browser, or tried clearing your Web browser cache?
How about using a Private window (Incognito mode) or a VPN connection if possible?
Is it the same behaviour on your mobile phone (4G LTE, mobile data, cellular)?