Delete Planner task

[MB_TING1]

There is a task in planner I cannot delete, it always comes back a second later, can someone help me?

[#2]

@MB_TING1 

The same here.

I get this error on the page: "You no longer have access to "[TASK NAME]" though I am the global admin and the task is assigned to me. I have read somewhere that this error happens because a group or a team is deleted. I have restored the group as suggested but the problem is still unresolved.

[#3]

Same here

[#4]

I have exactly the same problem :