Azure Virtual Network Gateway Fails Deployment

I'm on a trial subscription attempting to create a VM on a VN but can't seem to get the Virtual Network Gateway to successfully deploy. I'm tried dozens of combinations. We need to test out the service prior to moving to a long term subscription. Can I not do this under the current subscription?

Any help would be greatly appreciated.

Here's the error we're getting:

{"code":"DeploymentFailed","target":"/subscriptions/f68cce8d-82f1-XXXX-947b-b5cf6273e109/resourceGroups/SoninBeakoCloud001/providers/Microsoft.Resources/deployments/Microsoft.VirtualNetworkGateway-2024092609XXXX","message":"At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-deployment-operations for usage details.","details":[{"code":"InvalidResourceReference","message":"Resource /subscriptions/f68cce8d-82f1-XXXX-947b-b5cf6273e109/resourceGroups/SoninBeakoCloud001/providers/Microsoft.Network/virtualNetworks/SoninBeakoVN001/subnets/GatewaySubnet referenced by resource /subscriptions/f68cce8d-82f1-XXXX-947b-b5cf6273e109/resourceGroups/SoninBeakoCloud001/providers/Microsoft.Network/virtualNetworkGateways/SoninBeakoVNG001 was not found. Please make sure that the referenced resource exists, and that both resources are in the same region."}]}