Re: IPsec Between Fortinet and Mikrotik
I don't see any particular problem on the 40F config, although I would remove the second static route for 192.168/16. But it shouldn't break anything even if it's there.
I would suspect the other side, but first sniff packets on the FGT while you ping from FGT's local toward the other side. You need to disable asic offloading (set auto-asic-offload diable) on both policies in CLI to see all packets. Don't forget to reenable it after you're done.