Cannot add device

Cannot add device

We had a server that was in OpManager but it died and we had to rebuild it from a backup.
 
This was also then removed from the opManager console.
 
Now it is rebuilt I am trying to add it back into OpManager but it will not show.
 
I search for the device but opManager cannot see it.  I then click Add Device and it says it has added the device but I still cannot see it.
 
Anyone had this problme before and if so how do I fis it?
 
Thanks.
 
Rob

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