Turns out it was the router IP address at the SD-Wan location. Trying to figure out what is going on, I started disabling WAN interface (I have/had 2 connections at each location; fiber and cable at LAN and fiber and cable at SD-Wan location). After disabling one of the WAN interfaces at the SD-Wan location, I was unable to VPN back in there to continue testing. Looking further, I saw that the SD-Wan VPN tunnel is for some reason connecting to the backup/failover/WAN 2 IP address at the LAN location. I also noticed that the IPv6 status is "failed" for WAN2 at the LAN location. I'm going to try to unplug the LAn WAN2 interface and see what happens.
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