Why is the Canvas RCE accessibility checker missing?

Adjust your Ally configuration to show the Canvas RCE accessibility checker.

If you use Ally, you may have noticed recently that the Canvas RCE accessibility checker button is missing:

This is not related to DesignPLUS in any way.  To restore the native Canvas accessibility checker, go to your Ally Configuration in admin settings.  Find the feature called, "Instructor feedback for WYSIWIG content" and check the box called, "Also enable LMS built-in checker." This will enable the Canvas editor in addition to the Ally checker.