PING Through an SD-WAN Fortigate with 2 ISPs.

Fortigate 80F 6.4.10 with 2 WAN interfaces into an SD-WAN.

WANs are set up to switch to "secondary" if "primary" is down .. and back to "primary" when it is up.

I want to set up a PC to continuously ping (with a script) and traceroute out through each ISP.  So, a separate target destination for each WAN.

I've not gotten this to work yet.  I've been trying with the FG CLI.

wan1 is primary and active; wan2 is secondary and not active

exec ping-option source [wan2 IP]

exec ping-options interface wan2

But, pings don't work with this....

And, separately, setting traceroute-options

exec traceroute-options source [wan2 IP]

exec traceroute 8.8.8.8

yields the wan2 IP hop and no more....