Rolling out: Guest access support for tasks in Planner

Correct - this is still on the roadmap as under development - with a target availability date of Q1 next year (2018) - https://products.office.com/en-us/business/office-365-roadmap?filters=%26freeformsearch=Planner#abc Microsoft Planner: Guest User Access Microsoft Planner will support task assignment and collaboration with team members who are not a part of the tenant. This helps teams collaborate with their vendors and channel partners effectively. Estimated Release: Q1 CY2018 Feature ID: 14702 Added to Roadmap: 06/08/2017 Last modified : 12/12/2017 Tags: O365