Fortigate to Mikrotik IPsec Tunnel to Different Segment

I am needing to get to 10.4.0.102:80 through IPsec tunnel from 10.10.10.0/24 network. We are not in charge of the tunnel nor the IPsec Policy. They stated they allowed 10.4.0.102 to be accessed in tunnel, however setting my policy rule to 10.4.0.0/24 breaks the tunnel. I’m not sure how to bridge this connection.

Is this route possible?

Figure 1: Will not ping

Working Tunnel through Fortigate to Mikrotik setup
This is a working route but they are not jumping segments and had to do a lot of port trickery to get it to work over the bridge. The incoming ports from other locations were getting sent to the remote network :lol:

Figure 2: This is a working tunnel

Administrators on other end clicked the Gremlin button and it worked mysteriously