Problem with SD-WAN

we are currently having one static IP, just added a second one, for faster speed

tried to setup WAN2 as an interface, then created SD-WAN , for both WAN1 and WAN2

In performance SLA, i can see both WAN are working, as it gets to couple DNS and website (amazon, google, microsoft etc) no problem.

Problem comes when i unplug the WAN1, and the WAN2 itself doesnt funtion at all.

Any input?