BigSur Click on Dock App does not change to Space with App
This behaviour is toggled on a pref…
System Preferences &gt; Mission Control &gt; 'When switching to an application, switch to a Space with open windows for the application'
This needs to be on for the behaviour you desire.
It will fail if you have any app spread to more than one Space… but that always would. Spaces cannot handle multiple Spaces for a single app, that's not within design spec.