Works perfectly, activated via the following:
DISM /online /Set-Edition:ServerDatacenterCor /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula

REVIEW UPDATE:

Turns out i was activating this the wrong way like an idiot, all activated and working perfectly :)

The range of products on this website is impressive, and the customer service is always attentive and willing to help. I've had nothing but positive experiences shopping here.

PERFECTO , gracias funciona