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Did you have to reach out to your Cisco Meraki rep to unlock this? We are in the same position with multiple locations that have fridge monitoring. We would like to be able to assign access to individual networks.
Maybe try disabling the VPN on the site with issues and re enabling, or even reboot the MX. That is odd it shows not connected to the cloud. Might have to put in a support ticket.
We did not add any rules to the remote site MXs to get it to work. Maybe check in the VPN Status page see if you have an alert there telling you what might be the problem.