Creating tasks in excell online

Hi, I create a task on an online excel sheet by adding a note and then adding "@" user. I tell it to assign the task to this person (me) an I get an email saying I've assigned myself a task.

The question is where is the task?

I can't find it anywhere, I've checked: Outlook, Office then Planner, Teams then Planner.

I want to be able to track tasks in a spreadsheet but leverage the use of tasks.