You need to use a Radio profile to turn off 2.4Ghz for your SSIDs: https://documentation.meraki.com/MR/Radio_Settings/RF_Profiles 2.4Ghz is still used for MESH though. You can also disable this using these instructions: https://documentation.meraki.com/MR/WiFi_Basics_and_Best_Practices/Wireless_Mesh_Networking#Disabling_Mesh
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