Eduroam is usually WPA with EAP encapsulation (or the other way around). So there should be no question for a WEP Key.

Be sure to follow all instructions shown in #6 (I've deleted those, because I did not fully read the OPs post...).

Be sure to do this step!:
- Enter your outer anonymous identity in the textfield below
(anonymous@your-university.edu for example)

This is important for working EAP access.
Also you have to import your universitys keychain.

E.g.: Your university has a certificate, this one is signed by Thawte (unlikely, but just an example).
So you will have to import your university's certificate, Thawte would be predefined in the N900. If it were not, you'd have to import it as well. Then you have to check via the certificate manager, that the certificate is available for anything you can chose there (click on the certificate, usually on top).

And don't do anything via the commandline, this should be working with wlantool out of the box. You may just mess things up there...