We have upgraded our dnn from the version 7.04 to 9.0.2. there were 100 users and for couple of users when they trying to reset the password by receiving mail, just after user clicked the reset link in the mail, user gets the following error screen "The password reset link has expired and is no longer valid"
1. The reset link is perfect and i didn't see any extra character.
2. I checked the database they had enough expirty time.