the result of a click on user_pass_reset_url is access denied

Hello all,

I am sending out notification emails to certain users in my system.
Many of them might have forgotten how to log into my system.

That's why I create a new login with:

$url_login = user_pass_reset_url($account)

I add this to the email, but when people click on this link they get: access denied....

What could I be doing wrong?

Thanks,

Eugene