Since the 3rd of April, 2017 it’s possible to assign more than one user to a specific task. This was a feature that many companies and professionals were waiting for in Microsoft Planner. Planner is a great tool, love it, but the lack of this feature was keeping me away because in most scenarios that I work on I really need to have more than one user assign to one task. Also, some of my customer have the same need, but starting now I can start to implement Microsoft Planner in many customers. Good times ahead!
This feature was the most request feature in User Voice. If you find that Microsoft Planner is missing some features, please review if someone already add then to User Voice and vote for then, if you can’t find then on User Voice, add then yourself! Just go to https://planner.uservoice.com/forums/330525-microsoft-planner-feedback-forum
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