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You will have to remove it from the existing network https://developer.cisco.com/meraki/api-v1/remove-network-devices/ back into inventory and then assign it to the new network using https://developer.cisco.com/meraki/api-v1/claim-network-devices/
This network doesn't have any Meraki network devices (MX, MR) which is what this endpoint uses to collect information about clients. This is a systemsManager-only network, so this isn't the correct tool to use. You can see SM specific API endpoints h...