Hi rasmus,
i have magicinfo server v2, but had same experience, with my sbb i-player.
I needed to change its group, and unfotunatelly, maybe it is bug, i could do it anyway, so i needed to delete it and add it again in correct group.
Deletion worked perfectly
Then adding same as you - no device in unapproved list.
What I did and worked for me, the device in few minutes showed up in unapproved list:
- disable firewall (on server)
- restart it
- restart player
- wait
I am not sure if this was only coinsidence and you have bigger problem, by try it... And dont forget to check unapproved in list of that type of devices, that you need (lite, premium... )
Good luck