Nameserver conflict causing website to go down

What is the name of the domain?

What is the issue you’re encountering

Name Server Issues: My original objective was to gain Mailerlite domain authentication. Cloudflare is asking for us to change the nameservers of our website. When we update the nameservers, we obtain the Mailerlite authentication, however the website goes down. When we revert back to the previous nameservers, the site comes back up online however we lose the authentication. I am at a major loss as what to do and have gone through all I can with troubleshooting the issue. Can anyone assist as to how I solve this issue?

What steps have you taken to resolve the issue?

Have added new dns records to Cloudflare.

What feature, service or problem is this related to?

Nameservers

What are the steps to reproduce the issue?

Update the nameservers to what Cloudflare suggests. Mailerlite authentication process can be successfully achieved however, website gets an error (DNS_PROBE_FINISHED_NXDOMAIN) and it goes down.

This is because you have added your domain to 2 different Cloudflare accounts, changing the nameservers selects which one is active and so which set of DNS records is used.
https://cf.sjr.dev/tools/check?7a3c9b1ff4904ee09e91963d6e67f313#dns

You need to set all your DNS records in one account or the other and use the set of nameservers allocated to your domain for that account.

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