Nokia D211 supports association to network if SSID broadcast is disabled. We just recently tested this with the Cisco Aironet 350 access point. We have noticed that with "Broadcast SSID" disabled the association takes a little longer than usual but no more than 15-20 seconds. It might also affect that if you have an old software in your access point a software update may be required. In this case try finding an update from the AP manufacturer's web site.
Nokia D211 Support