I have a problem with MS Planner as a guest. I was invited by a company to MS Planner with a link. The link worked and I can see the plan and the tasks but I can´t add tasks or edit tasks. If I click the "Join" button to be able to add or edit taks I will be kicked out of the group in 5 secounds and it says Im not a member of this group and I have to click the "Join" button again but it kicks me out every time. Is this a bug or do I need to buy office 365 as a quest?