Nokia :: Wifi PEAP - MSCHAPv2 Authentication In Combination With Microsoft NPS

I'm setting up a wireless network with an authentication backend based upon Microsoft NPS and Microsoft AD:

Nokia E71/E72
Laptops <=> Trapeze AP's <=> Trapeze WSS <=> MS NPS <=> MS AD
HTC S740

The authenticationprotocol we're using is PEAP-MSCHAPv2. In short I can't seem to get it to work on either a Nokia E71 or E72 while it works perfectly on our laptops using either the native Microsoft WZC or Intel PROSet and on a HTC S740. In the NPS event log, the same event occurs 3 times (some information is obfuscated for obvious reasons), the critical part I guess is the last line "An internal error occurred". I can really only guess why there would be an internal error with the Nokia phones and not with any other phones or laptops. The eventlogentry on the Microsoft NPS:...............