Step 1 = Click Configuration, select Templates, and then select Feature Templates. Step 2 = Click Add Template, select the device, and then click Basic Configuration. Step 3 = Shut down the tunnel and then remove the ISAKMP profile. Step 4 = Attach the IKEv2 profile and then run the no shutdown command on the tunnel.

The process of configuring a site-to-site IPsec VPN connection between an on-premises Cisco IOS XE router in Controller mode and AWS, and changing the IKE version from IKEv1 to IKEv2 in Cisco vManage involves several steps123.

Click Configuration, select Templates, and then select Feature Templates: This is the first step where you navigate to the Templates section in the Configuration menu of Cisco vManage1.

Click Add Template, select the device, and then click Basic Configuration: In this step, you add a new template for the device and proceed with the basic configuration1.

Shut down the tunnel and then remove the ISAKMP profile: Before changing the IKE version, you need to shut down the existing tunnel and remove the ISAKMP profile that is configured for IKEv12.

Attach the IKEv2 profile and then run the no shutdown command on the tunnel: Finally, you attach the newly created IKEv2 profile to the tunnel and bring the tunnel back up2.

References :=

Configuring Internet Key Exchange Version 2 (IKEv2) - Cisco

Switch from IKEv1 to IKEv2 on Cisco Routers - Cisco Community

Configure IOS-XE Site-to-Site VPN Connection to Amazon Web Services - Cisco Community