I'm not sure, but maybe you have to whitelist the SSID's if Meraki different wireless-devices is not that smart and aware of each other. You do that under Wireless/Monitor/Air Marshal.
The MX SSID is a rogue for the MR and both do not share any information. There will be no fast roaming between them and RRM does not know how to deal with that.
You shouldn't do this. They two systems don't inter-operate. If you do then make sure you disable Air Marshall for the MR otherwise it will constantly think it is under attack.
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