Has anyone successfully used BT DUN with a Nokia 770 Internet Tablet and a Sprint branded Treo 650?

I realize that its pretty early in the game for the new Nokia 770, but I've been completely unsuccessful in being able to pair my Sprint branded Treo 650 with the 770 for DUN. I've enabled Bluetooth, made it discoverable, and enable DUN on the 650, and the 770 is able to find the device and start the pairing authentication, but after that I get an immediate disconnect and the Treo 650 is no longer available as a network connection on the 770. I've tried the usual resetting of both devices, turning Bluetooth off/on, DUN off/on, etc. but no joy.

If not the Treo 650, anyone else with a Sprint BT enabled phone been able to pair these two devices?

Ah, the joys of being an early adopter...

Any suggestions highly appreciated.

Cheers and thanks,