The RMK instance is on a different Datacenter than the RCM instance
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Technically, it's not an issue. You can connect any RCM instance from any datacenter to any RMK instance no matter the Datacenter, you just have to use the right urls in provisioning and pick the right datacenter in Command Center / Site setup / SSO.
The only thing that we recommand is to connect a preview instance RCM to a stage instance RMK and a production instance RCM to a production instance RMK.
2539024 - Error: "Please configure RMK datacenter URL in Provisioning" when clicking RMK dashboard
datacenter, RCM, RMK, command, center, server , KBA , LOD-SF-RMK-INT , Integrations with RCM, SSO, MOB, ONB etc , Problem