Additional file-related features and issues within Microsoft Teams for Education
Dear Carlos_BSVz
I am Renzo, as an Independent Advisor and Office user, I'll help you with your question.
There are a few reasons you might not be able to see or add task comments:
- If your organization is not using Exchange Online for your account, you may not be able to comment on tasks in Planner.
- External users from non Office 365 work/school tenants aren't able to add comments in tasks from Planners.
Take a look at below suggestion: