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Sometimes the Dynamic DNS setting does not automatically update when it is supposed to. Also, many dynamic DNS services are now paid subscriptions.
If you do not own a public IP address, then your internet provider assigns you one via DHCP, (Dynamic Host Configuration Protocol).
"What Is My IP" is a Windows service that runs on one or more of your home computers or servers. It checks your external IP address once per day or as frequently as once every 30 minutes. If your IP address changes, it sends an email or SMS to you. All of this is configurable.
If you are a Gamer you might. Also, many small businesses, companies that employ fewer than 50 people, do not purchase a static IP address for a variety of reasons. Notwithstanding the reason to not have a static IP, the company might rely on VPN (Virtual Private Network) or use SSH (Secure Shell) as a means to access the corporate network. Perhaps someone needs to work from home, or two satellite offices need to be linked to the main office. To access your network from the internet, you need to know your router’s public address.
Companies like DYNDNS, or Duck DNS, or No IP, or yDNS, zonomi, or hopper, allow you to attach a DNS host name to your public IP address. Some routers automatically update your dynamic IP address with your dynamic DNS provider so that when your public IP address changes, your DNS is up to date.
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Sometimes the Dynamic DNS service does not work for various reasons. Certain Verizon Routers have an entry in the router for Dynamic DNS, but the router never updates it, almost like the function in the router is disabled.