[Answered ]-How do you make a url that passes a parameter work in Django?

You have two issues here:

1. Remove the trailing / from your pattern, or make it /? so it will be optional.
2. /d+ will only match digits, and your link also contains other characters. Try [a-z0-9]+ instead.

Complete pattern:

^accounts/confirm/(?P<activation_key>[a-z0-9]+)$