-When you scale up/down in instance size, the amount of IP addresses used by the App Service plan is temporarily doubled while the scale operation completes. The new instances need to be fully operational before the existing instances are deprovisioned. The scale operation affects the real, available supported instances for a given subnet size. Platform upgrades need free IP addresses to ensure upgrades can happen without interruptions to outbound traffic. Finally, after scale up, down, or in operations complete, there might be a short period of time before IP addresses are released. In rare cases, this operation can be up to 12 hours and if you rapidly scaling in/out or up/down, you need more IPs than the maximum scale.
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