What to Check After Changing Your Nameservers

https://theuptimejournal.slatecurrent.com/posts/what-to-check-after-changing-your-nameservers

After you update your nameservers, it can take up to 48 hours for the changes to fully propagate across the internet. During this time, your website may be accessible from some locations but not others. You can verify propagation status using online DNS lookup tools—just enter your domain to see if the new nameservers are showing globally. Also, check that your email services (if hosted separately) still work, as DNS changes can affect mail delivery if MX records need updating separately.