ksshaskpass not prompting for password at login

[Oldiesmann]

I recently upgraded laptops from a Lenovo G500 to an HP Pavilion 15-CW1068wm. On this laptop as well as the old one, I'm dual-booting with Windows 10 and Arch Linux. On my old laptop, I installed ksshaskpass and added code to .bash_profile to make Arch prompt me for the password for my SSH key at login. I did the exact same thing on the new laptop, but I'm not being prompted for a password at all - it does launch the ssh-agent and set the SSH_ASK_PASS environment variable.

This is the code in .bash_profile

#
# ~/.bash_profile
#
[[ -f ~/.bashrc ]] && . ~/.bashrc

if [ -z "$SSH_AUTH_SOCK" ] ; then
        eval `ssh-agent -s`
        export SSH_ASK_PASS="/usr/bin/ksshaskpass"
        ssh-add
fi

Any idea why this might not be working?