Some Canvas integrations are maintained at the course level, so that only specific courses have access to these integrations. When courses are copied between semesters, these integrations can break and need to be re-established.
How will I know if the integration needs to be re-established?
When attempting to launch an integrated tool from within Canvas that needs the connection re-established, you may see the below error (see Fig. 1).

Figure 1: Couldn't find valid settings for this link
How to request that the tool be re-enabled
You may submit the form to request a course level tool enablement. This should only be used for existing, approved tools. New tools should be requested using the Requesting new software tools service.