Symptoms:
Adding Edge\DLR to a Logical switch fails with error "need resourcePool resource to be prepared for network fabric".
VMware NSX for vSphere 6.4.x
This issue occurs when the Edge or DLR is running on a un-prepared cluster.
To resolve this issue, ensure that the DLR is deployed on a cluster prepared for NSX.
If the DLR is actually on a prepared cluster, the issue could be due to some issue on the EAM service, restart the EAM service.