Can I request a Static Public IP address for my VPN gateway?
Zone-redundant and zonal gateways (gateway SKUs that have AZ in the name) both rely on a Standard SKU Azure public IP resource. Azure Standard SKU public IP resources must use a static allocation method.
For non-zone-redundant and non-zonal gateways (gateway SKUs that do not have AZ in the name), only dynamic IP address assignment is supported. However, this doesn't mean that the IP address changes after it has been assigned to your VPN gateway. The only time the VPN gateway IP address changes is when the gateway is deleted and then re-created. The VPN gateway public IP address doesn't change when you resize, reset, or complete other internal maintenance and upgrades of your VPN gateway.
See the link Create a Site-to-Site connection using Azure Virtual WAN
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