The only issue i see with your Reset password URL is: The URL is encoded!
That may be your email program issue.
Please try to switch modes!
Pie-Register >> user Notifications >> Forgot Password Template
This problem may limited to your own environment, I am assuming you have
latest version of Pie-Register installed. please use our contact form to
send over the login info if you’d like our engineers to figure out the
problem on your end.