It's 2021 and this seems to be the same issue I'm fighting. I have a ticket open to discuss with Meraki, now to clarify that the MX Content filter is indeed being applied to the MR WAP itself, preventing my group policy with relaxed content settings from having any affect on my wireless clients. If I follow your found fix, the only thing missing from the original config is the new SSID no longer prevents clients from seeing each other as it did when it was the Meraki NAT mode. Is that correct?
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