@Soumyajit Das , Just following on this, if you have got a chance to see the previous response? To benefit the community find the right answers, please do mark the post which was helpful by clicking on ‘Accept Answer
Do let us know if you're leveraging Azure App Service WebApp or some other Azure service, we will be happy to help you point in the right direction.
Just copying below from the doc that AlanKinane had shared:
When inbound IP changes (For App Service WebApp)
Regardless of the number of scaled-out instances, each app has a single inbound IP address. The inbound IP address may change when you perform one of the following actions:
-Delete an app and recreate it in a different resource group (deployment unit may change).
- Delete the last app in a resource group and region combination and recreate it (deployment unit may change).
- Delete an existing IP-based TLS/SSL binding, such as during certificate renewal (see Renew certificate).