In the vCenter linking tab of the SDDC grouping, vCenters of the SDDC show as 'Failed" with the following error:
Error: 500 Internal Server Error: "{"type":"com.vmware.vapi.std.errors.internal_server_error","value":{"error_type":"INTERNAL_SERVER_ERROR","messages":[
{"args":["com.vmware.vapi.std.errors.InternalServerError"],"default_message":"Provider method implementation threw unexpected exception: com.vmware.vapi.std.errors.InternalServerError","id":"vapi.bindings.method.impl.unexpected"},{"args":["Service Unavailable: Session count exceeded"],"default_message":"Provider method implementation threw unexpected exception: Service Unavailable: Session count exceeded","id":"vapi.bindings.method.impl.unexpected"}]}}"