I have two MX100 devices I want to setup for NAT-HA. In the dashboard when I go to the "configure warm spare" button, it will not allow me to enter the serial number of either device. Thus I can not configure a warm spare. The devices are setup according to the following documentation https://documentation.meraki.com/MX-Z/Deployment_Guides/NAT_Mode_Warm_Spare_(NAT_HA) Direct Connected Please advise. Thanks
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