As you are probably already aware, if not check this https://blog.hametbenoit.info/2022/09/28/azure-you-will-need-to-upgrade-your-basic-public-ip-by-end-of-september-2025/, the basic public IP SKU is going to be deprecated.
With this coming depreciation, some VPN gateway SKUs are impacted:
- High Performance
If you are using any of these VPN Gateway SKU you will need to upgrade them to any of other available SKUs by September 30, 2025.
You will have an option available to perform this upgrade post December 2024.
If by August 2025 you did not upgrade your VPN Gateway, your gateway will be automatically upgraded:
- Standard will be upgraded to VPNGw1AZ
- High Performance will be upgrade to VPNGw2AZ
More details can be found here https://learn.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-about-skus-legacy/