As a general rule bookmarks for the system should be saved in there simplest form, without link endings.
Correct: https://IIS.Link.se
Wrong: https://IIS.Link.se/account/login?returnUrl=%2Fconnect%2Fauthorize%2Fcallback%3Fclient...
The link ending can namely be changed from version to version. If a user is not able to reach the system using a bookmark after an upgrade, try erasing the link ending.
Note that the system automatically, immediately after entering the short link, adds the link ending. If you at this point save a bookmark this can be faulty after upgrade.