can't add node after deleting it

i deleted a node via curl like this:

curl -k -u <user>:<pwd> -X DELETE -v https://orion:17778/SolarWinds/InformationService/v3/Json/swis://orion/Orion/Orion.Nodes/NodeID=2215

and it successfully deleted the node (its a rhel 7 vm) but now i cant readd the node back. i usually install the linux agent and it will appear in Orion but now after deleting the node, and reinstalling the linux agent, it refuses to be added. anyone ever experience this? how do i add the node back?