We are actively working on Meraki SD-WAN data collection and support for SD-WAN. We have some devices in our lab we have been using for development and testing, but would like to get some SNMPWalks as well of customer environments
If you are willing and able, you can follow the info here and send to me directly
https://support.solarwinds.com/SuccessCenter/s/article/Troubleshoot-connectivity-and-MIB-issues-with-SolarWinds-SNMP-walk-IPv4-only?language=en_US
Additionally, interested to hear more about your configuration/setup. In your SD-WAN setup, do you currently have multiple orgs or controller and if yes, how many?