Next instance, Previous instance shortcut on Mac not working

[GerhardHuman]

Hi all, don't know if I'm just doing something wrong but I can't get the keyboard shortcut working to navigate between instances on the timeline...
It seems like it's assigned to Cntrl+leftArrow and Cntrl+rightArrow but it does nothing... left and right normally navigates on timeline.
I even tried Cmd+Left/right but also nothing

Am I doing something wrong?

Screen Shot 2019-02-20 at 07.02.48.png (76.97 KiB) Viewed 7150 times

[GerhardHuman]

OK nevermind I found the culprit. Mission control was using those keys so when you disable that in Settings then it works