Welcome to the Community,
The VM is configured with at static IP but when I execute an ipconfig the IP displayed is the self-assigned private IP from Microsoft.
IMO this is an issue with the guest OS rather than ESXi. Either you have a static IP (in the GUI and with ipconfig) or you don't.
If setting the IP address does not work, remove the NIC in the Windows device manager and let Windows re-discover the hardware.
André