You support TTLS-PAP, and nothing based on MSCHAPv2. That locks out Symbian users because they don't support inner PAP.
It's easy to turn on TTLS-GTC support; it works just like PAP (yes, with any password hash in the backend) but *is* supported by Symbian.
So, if you want to enable maximum client compatibility for your IdP, please configure TTLS-GTC on your server and let us know.
Further info: DJ3.1.2,1, Chapter 4.4.