Can anyone point me in the right direction? The client is the technical contact and needs to setup the licenses on premises, but documentation doesn't match the new portal. They cannot see the "my license", and neither can we. Following these instructions: https://world.mendix.com/display/howto40/Activate+your+Mendix+license LR.
If you log in to https://support.mendix.com you can manage your licenses from the 'Applications and Licenses' tab of the Support page
On a project where I'm the technical contact I can see the "generate key" button under View License / license tab.
All very clear now and able to support the client/clients with same queries.