Fortigate or FortiClient Enterprise Management Server (EMS) was not found

Hiya,

After upgrading my Fortigate 40F from 6.2 to 6.4 I have been unable to register the FortiClient with Security Fabric.

FortiClient version: 6.0.10.0297

Fortigate 40F: v6.4.4 build1803 (GA)

Security Fabric Connection is enabled Administrative Access.

I have also tried logging in using port 8013.

Kind regards,

Reuben