unable to add fortigate to fortimanger

Dear community member,

I have searched a lot to solve the issue and read a comments but not helped much - unable to add fortigate to Fortimanger.

Fortigate vm version - 7.0.15  (trail)

Fortimanger vm version 7.2.10 (trail)

I can ping from Fortigate to Fortimanger vice versa. 

Below services are enabled at fortigate interface.........

FMG, security febric, http, https, ping.

Please suggest what I am missing, I have also attached snapshot.