After delete, cannot add, shows already deleted

After delete, cannot add, shows already deleted

Hi,

I click unmange and delete the device (Cisco).
I want to add it again, I noticed that the IP of device i was not delted.
Okay, i turned off the nflow agent on device restarted the nflow service.
Still Cisco IP appears on the selecttion of available device.
Reinstall agent.
Add Cisco, okay bind the device IP but on the main dashboard,
Already deleted ?
It also doesnt show onthe add interface and license management.

How do I Re-Add the device upon deletion.

Many Thanks












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