VNet1 contains subnet1 and AzureFirewallSubnet. A public Azure Firewall (FW1) is deployed and RT1 is a route table associated to Subnet1 with a 0.0.0.0/0 route pointing to FW1. After deploying 10 Windows Server VMs into Subnet1, none of them were activated. To allow the VMs to activate, what should you do?

The correct solution is to add an internet route to RT1 that allows connectivity to the Azure Key Management Service (KMS). Windows Server VMs require access to KMS for activation. While the default route sends traffic to FW1, FW1 itself needs to allow this outbound traffic. However, the core issue here is that the KMS service is an internet-based service. The existing route to FW1 as the next hop for 0.0.0.0/0 means all internet-bound traffic from Subnet1 goes through FW1. If FW1 is blocking this traffic, or if the KMS service requires direct internet access not proxied by FW1, the VMs won't activate. A more direct route for KMS traffic, or ensuring FW1 permits it, is necessary. Creating an outbound rule on FW1 using the AzureCloud service tag is too broad and doesn't specifically target KMS. Deploying a NAT gateway is for outbound SNAT and doesn't directly solve the KMS activation issue. Configuring a DNAT rule on FW1 is for inbound traffic, not outbound activation requests.