MS Planner Notification (with guests in a Team)

Hello,

I successfully activated the notification in my MS Planner settings. Now I get notifications whenever an assignment is addressed to me or is due.

As you can see here: 

This was possible by clicking on the adjustment button on the top right corner of the webversion of MS Planner. Unfortunately our SAP Consultants don't have a settings button in their web version. Is this an authorization topic or why are team member who have the status of "guest" no adjustment button (to activate the same thing)? They just see a black bar.

(Background information: We have a team with our consultants in which I am the team owner and the consultant are guests. We address certain tasks via the MS Planner which is integrated in our team.)

Thanks in advance.