Using the rest endpoint for the Meraki plug-in, I was able to copy the configuration settings from dev to prod.
But prod will not connect to Meraki.
When you enter the Merkai API Key into the configuration, the Meraki plug-in encrypts the key.
So what you copied from dev to prod was not the Meraki API Key, but the encrypted value of the key.
Release : 3.7
Component : Virtual Network Assurance For CA Performance Management
Get the original Meraki API Key or generate a new one and edit the production configuration to use the correct key.