SDWAN with 3cx failing the firewall checker

Just wondering has anyone came across setting up a 3cx phone system with a SDWAN connection. To make things more interesting, the ISP's SDWAN is connected to our company firewall (Fortigate 200e) so that we can manage policy and rules.

However, doing so leads to errors on the 3cx's "firewall checker". The checker lists port testing errors stating that (5060, 5090, 9000-10743) are not reachable. I am thinking this might be caused because the SDWAN doesn't know how to preserve the ports.

I hypothesized this theory because if I decided to unplug one of the internet from the SDWAN box and hook it up directly to my fortigate, the test result will pass. However, we don't want to split the two internet up because that will defeat the purpose of having the SDWAN in the first place.