The Basic SKUs allow only 1 connection and along with other limitations such as performance, customers using legacy devices that support only IKEv1 protocols were having limited experience.
Traditionally we allowed IKEv1 connections for Basic SKUs only and allowed IKEv2 connections for all VPN gateway SKUs other than Basic SKUs. About IKEv1 and IKEv2 for Azure VPN connections This article discusses how you can configure Azure VPN gateways to satisfy your cryptographic requirements for both cross-premises S2S VPN tunnels and VNet-to-VNet connections within Azure.
