FortManager and FortiGate trial together

Why oh why does Fortinet make all this so difficult, it seems like they actually don't want people to even use the trials…

I finally have a FortiGate trial VM and a FortiManager trial VM, but can I get them talking? No!

Lots of commands that are no longer valid etc...

FortiManager reports a probe fail, from online searches, I have tried lowering the encryption settings and allowing VM registration on the FortiManager. I have tried registering from the FortiGate side also.

Now it transpires that my FortiGate trial VM does not have the right factory cert because it is does not contain the serial of the virtual appliance, just a generic "Fortinet".

I have tried regenerating the certs, tried re-execting the VM commands but it does not accept them either…

To be honest it feels like a battle just to make the trials work, which is hardly a good starting point.