Issue locating unmanaged devices

I am trying to locate unmanaged devices so I can push out the Ivanti Agent.

I am inputting the IP range and it is picking new unmanaged devices up (see below).

However, there is no device name and it is suggesting the OS is Linux (the devices are Windows 10 thin clients) and i cannot push out the Agent.

I just wondered if anyone can offer any suggestions as to why this is happening?

Cheers

Phil