This gateway is disabled. Its Domain Name Service (DNS) configuration is not working

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Meraki AP's rely on DNS to resolve the Internet hostnames of the Meraki Cloud Controller. A Meraki gateway AP obtains its DNS server configuration statically or dynamically (DHCP option 6). A reliable DNS server is required for a Meraki network to operate properly. If a gateway AP is configured with an unreachable, unresponsive or incorrect DNS server your network and Dashboard will experience the behavior below.

The AP icon on the Monitor > Access points and AP detail page are yellow.
The alert "This gateway is disabled. Its Domain Name Service (DNS) configuration is not working." is reported on the AP detail page.
The bars on connectivity graph for the AP will be orange.
When you place your pointer over the orange bars of the connectivity graph located on the AP detail page, the message will state "Disabled gateway (bad DNS)".
The radio/power LED on the AP will be solid orange and the signal LED's will be flashing green.
You will see wireless networks appended with "-bad-gateway".
Users cannot connect to the Meraki network.

To remedy this issue, please do the following

Configure your AP's with valid reachable DNS servers, e.x. Google Public DNS.
If there is a firewall between your AP's and the configured DNS server make sure UDP port 53 is open.
You can connect to the SSID appended with "-bad-gateway" to reconfigure your static IP address settings which includes your DNS servers.

See also the knowledge base articles: Understanding Common Dashboard Alerts for MR Access Points