An error occurred while saving the commentRochna Tebbutt commented
I found a solution to this issue. This is what I did;
1. Navigate to the tab in Teams.
2. On the far right of your screen you should see a Globe icon, it should say "Go to Website" if you hover your cursor on it. Click on the Globe icon.This will take you to the web version of the Planner.
3. Click on the plan name (This would be the original Plan name that you were trying to rename in Teams.)
4. Rename the Plan name to match the one in the Teams tab.