Disable ability for user to change password in Azure AD

Kamal Bhatt Can confirm that doesn't prevent users from changing their Office 365 account password under "View Account - Change Password".

This may prevent a user from changing their password from within Outlook, but certainly doesn't not prevent them from changing their O365 password. 

Only way I've been able to prevent the password change is to disable Password Writeback on AAD connect. This will generate the "Your organization doesn't allow you to change your password here" when users try to change their password via their Office portal. 

I know then this defeats the purpose of selective password writeback / changing, but that's all I've been able to find so far. 

If anyone else has any other suggestions, I would absolutely love to hear them.