The short-cuts on the left side of the user interface is useful for jumping between different plans. However, it only shows two letters for each group e.g. CB for consumer b2b.
It would be great if a plan/group could have an icon instead to make it recognizable.

Allow Group Admin to set permissions for members of the plan -
E.g. Who can add/delete/assign tasks.

Outlook tasks are outdated and have tons of limitations. REPLACE Tasks with Planner. Include Planner as part of all O365 plans offering Exchange Online. People who use Outlook with Exchange Online should get the Planner Version of Tasks. This to my mind would kill all competition in the mail client + task management areas across all devices.

Planner is not sending my team members email notifications when they are assigned a task. What can I do to make it happen?

It would be useful, eg for Management Reporting to be able to provide someone with Read Only access across all Plan's you are in/own

This tools is great for tracking teams and reports. I'd like to have an option to export the data to share with management and peers or simply as a historical reference. It would be awesome if the reports could maintain the vision that is displayed in the UI.

If guest user adds task to my plan and I ask additional questions in comments - the guest user will need to reply somehow. I can't understand why guest comments are blocked.

I want an option to disable notifications for comments.

I do not want to email the entire Office365 Group every time I add a comment. You can't disable this.

Furthermore, if I did want an email to go out, it should be identified as coming from Planner rather than an email from me.

Whilst the new feature of assigning tasks to more than one person is excellent there still needs to be a way for each person assigned the task to assign the status as it relates to them. Otherwise, a task with multiple parts or people assigned to it cannot indicate their part in the completion.

Start day on Monday. I cannot see where to change this option

Showing completed tasks at the bottom of each bucket isn't very helpful when the list of completed tasks is enormous. If Search functionality for Tasks can be added and cards can be archived, that cleans up the buckets and keeps all of the pertinent information at the forefront. If I want to look for a completed task, searching by text makes the most sense to me rather than digging through a list of completed tasks until I find the right one in one of several possible buckets.

I would like to be able to duplicate a bucket with just a copy and paste feature.

Provide an option for a printable version of MS Planner, ether of the planner hub of a particular task. Also, a printable report. Most administrators want a to see a physical report of progress. If there is a way to print plans, tasks, and charts to present to administrators.

The ability to add multiple checklist to a Planner Card significantly increases the flexibility of use cases for Planner Cards. Additionally, adding the ability to add due dates to each item on a checklist enhances the ability to manage the activity documented in the Card.

Allow external users to participate in planner

Create a notification center inside Planner that will keep you up to date on all subscribed changes inside Planner. Notifications should display updates on all projects and tasks that you follow or are assigned.

After you’ve read or taken action on a notification in the Notifications tab, you can archive it.

You should be able to take action on tasks while reviewing Notifications.

Asana has a wonderful notification system called Inbox. It helps to reduce email notifications and provides notifications in-app. https://asana.com/guide/help/fundamentals/inbox

Color coding the buckets in Planner will really help my visual eye keep my various projects organized. If I really had it together, I'd use the same color to track e-mail to-do's and physical analog folders. Let there be color!

Should be able to track effort and impact of each task to help with prioritization.