Registration Key not showing?

[RobinUK]

Not sure if this is in the correct place, so apologies in advance if not.

Just had my first 1550 delivered and I'm trying to register it. It saying I need to hover over the MAC address to get the registration key but when I do nothing is shown. Tried chrome, edge and internet explorer.

What do I need to do?

[PhoneBoy]

As far as I know, the MAC address is really all you need.
A screenshot of what precisely is asking for this might help.