For subscription notifications a link is displayed always, even for cancelled subscriptions, and when the substitution is not active, an error message is shown.
Other terms

UWL, subscription, active, link
Reason and Prerequisites

UWL is not able to show links and non-links in the same column for the same item type in the same status. For instance for an active subscription a link would be optimal to be displayed, however for a canceled subscription notification no link should be available. But as of now it is not possible.
Solution

The behaviour is a limitation, the link is live for active subscriptions, but we cannot prevent on clicking on a non-active subscription by not showing it as a link, and it is not possible to configure the error message further. With the current UWL architecture the current solution is the only possibility.