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Hi Julie,
Based on the UserVoice, the limitations in Microsoft Planner are not changed and we can understand the importance of it. So, we request you add your vote and provide the feedback in Planner UserVoice, some ideas about this has been posted:Remove common limitations, Remove 1500 Tasks created Per User Limit.
If this request is planned by the Planner team, they will change the status of the Idea as below:
Got a latest update from the related team, where limits are continually increased as the product group review usage and their own performance improvements. You can check the reply on March 21, 2019, in the UserVoice (Remove 1500 Tasks created Per User Limit).
We appreciate your understanding.
Thanks,
Chitrahaas
[Updated by Chitrahaas Nalla MSFT, 01:01 AM, March 22, 2019(UTC)]