Access Plans from Microsoft Teams in Planner apps

Go to planner on the web.

Find your task and click the ellipses and Copy Task.

I get a dialog that has:

• New Task Name
• Plan Name
• Bucket Name
• Task info to copy (7), some of which get disabled if you change the plan. You cannot apparently copy Assignment, Attachments, Labels, between planners.

In the Plan name is a dropdown of a bunch of our planners. 

I actually see the exact same thing if I am in a Plan inside of Teams. Sometimes Planner items In Teams doesn't have all of the same stuff. You cannot add attachment in Team tasks, but you can on the web. Teams only allows URLs and Sharepoint links, not actual files, so there is still not 100% parity for planners between the Teams UI and website UI, but copying tasks appears to be working.