to do task bar not showing any tasks

hi there, my outlook (new version) to do bar (on the right) does not show any tasks, whereas i have about 40 tasks in it which i can see online if i hit 'manage all tasks' and go to tasks. 

previously it was also in outlook, but it randomly disappeared yesterday, without a reason i am aware of. how can i get this back in the task bar? 

thank you!