Fortinet 1550VE Controller running Vmware on Windows Server 2012R2

We have been trying to run our 1550VE controller in Vmware under Windows Server2012R2 - But we are running into issues with L3 Discovering AP.

Everything except L3 discovering is working fine, but we are only able to discover AP in L2.

We moved the controller to a Windows Server 2008R2 and L3 is working fine.

Anyone have any idea what can cause this issue?