iOS 9.3.1 and windows 10 when password is changed

[Stefano Zanmarchi]

I can't get both windows 10 and iOS 9.3.1 supplicants prompt the user for a
new password when the cached password isn't valid anymore.

Setting "send_error = yes" in mods-enabled/eap was working fine with
windows 10.
Sadly "send_error = yes" now causes iOS 9.3.1 not to prompt the user for a
new password, while iOS<9.3.1 always did (regardlessly of how send_error is
set).

Has anyone faced this problem yet?
Thanks,
Stefano