Urgent Assistance Needed: Domain Propagation Delay for Netlify DNS Configuration

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Using external DNS configuration is a good option here are the changes you say you have made are not reflected.

Here’s a quick guide

[Support Guide] DNS Quick Start - How to set up DNS

Last reviewed: August 2023 Note: All options discussed in this guide assume you have already added your custom domain to your Netlify site. Hi there! Need to get your site up and running with DNS? Start here with either Newly purchased domain or Existing domain that you’ve already used. Newly purchased domain If you have a brand new domain purchased from a registrar such as Namecheap or GoDaddy, and you want to quickly get your DNS set up, you have two options: External DNS - Create these …

Here is the related documentation

Configure external DNS for a custom domain