iOS 9.3.1 and windows 10 when password is changed

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