When the SSID visibility drop down is set to Hide this SSID under Configure > SSID availability, a Meraki AP will not send beacon frames for that wireless network. Therefore, the wireless network profile must be configured manually on the wireless client so they can connect.
When configuring the wireless profile on the client device the SSID name and WPA2 passphrase are case sensitive and must be identical to how they are configured in Dashboard. If you do not have the SSID name value entered correctly on your wireless client, your device will not be able to receive a response from the AP when probing for the wireless network.
WPA2 uses the SSID value and the passphrase to create the Pairwise Master Key. If you have the either the SSID value or passphrase value entered incorrectly on your wireless client, you will have the wrong PMK value and will not be able connect. If you are unable to connect to a hidden wireless network verify that the SSID name and WPA2 passphrase are configured identically on the wireless client and on Dashboard.