Az lab Create and manage a Windows virtual machine that has multiple NICs

Create and manage Windows VMs in Azure that use multiple NICs – Azure Virtual Machines | Microsoft Learn

Virtual machines (VMs) in Azure can have multiple virtual network interface cards (NICs) attached to them.

A common scenario is to have different subnets for front-end and back-end connectivity.

You can associate multiple NICs on a VM to multiple subnets, but those subnets must all reside in the same virtual network (vNet).

Resources

Vnet -> subnets

And two nics

Create a VM with a static private IP address – Azure portal | Microsoft Learn

On the Network interface page, under Settings, select IP configurations.
In IP configurations, select ipconfig1 in the list.
Under Assignment, select Static. Change the private IP address if you want a different one, and then select Save.
Warning
If you change the private IP address, the VM associated with the network interface will be restarted to utilize the new IP address.

Add a NIC to an existing VM

To add a virtual NIC to an existing VM, you deallocate the VM, add the virtual NIC, then start the VM. Different VM sizes support a varying number of NICs, so size your VM accordingly.

If needed, you can resize a VM.

Running VM