VMWARE ESXi and Winddows VM Licenses

 We have one VMware environment with 3 servers each with 2 CPUs, to be properly legal he acquired 6 Windows Server Datacenter Edition licenses, what happens is that when he is trying to activate the VMs that are in Windows Server Standard he gets the error that you see in the image.

Licensing was carried out correctly as described in the Windows Server 2025 License Guide, in summary: all CPUs and Cores) in the virtualization cluster were licensed.

can anyone advise the right way to use the Datacentre License in ESXi environment?  

thanks in  advanced