That tells me the N810 did not try to re-connect to the keyboard.

I had the igo but gave it away so I did not test my N810 with the igo.

But I just tested my N810 with the BT Nokia SU-8W:

Paired, turned off SU-8W, disconnected on the N810, turned on SU-8W, the BT on N810 turned BLUE and auto-connected to the SU-8W.

You should delete the paired device again on the N810, pair it again with a name w/o space(s)
to see if it works or not. That is what I recall when I had the igo.