Azure Bastion is a service that provides secure and seamless RDP and SSH access to virtual machines directly from the Azure portal, without exposing them to the public internet1. To use Azure Bastion, you need to deploy it in the same virtual network as the virtual machines you want to connect to2.
According to the tables, you deployed an Azure Bastion host named Bastion1 to VNet1. Therefore, you can connect through Bastion1 to any virtual machine that is in VNet1 or a virtual network that is peered with VNet1. VM1 and VM3 are both in VNet1, so you can connect to them through Bastion1. VM2 is in VNet2, which is not peered with VNet1, so you cannot connect to it through Bastion1.