If you are adding it to the MX, you can exclude the subnet. 1) ensure AP management IP addresses are in their own subnet, separate from all other traffic. 2) exclude that subnet from umbrella, as per the documentation linked to by @DarrenOC. As the Meraki DHCP clients will appear to the MX with the APs IP address, they will be excluded. If you have another SSID using Meraki DHCP, then it will also be excluded, so change it if you don't want that.
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