Last time I had some struggle to connect a FRITZ!Box (7530AX, but should be the same for all newer models) to a Fortigate.

The starting situation is as follows:
Home/Local Site: IP 10.0.0.0/255.255.255.0 (/24), Static IP, Public hostname xxx.home.com
Remote Site: IP 172.31.1.0/255.255.255.0 (/24), Static IP 1.2.3.4

I had found several tutorials but most of them are outdated or did not match my requirements. So I took some time (several hours) to find out the right settings needed.

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