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Checking using the details provided, I believe that this issue is related to a bug where Labels that contain the + characters can't be deleted.
Please, confirm if the Labels that you want to delete has this special character and use the workaround mentioned in bug to fix this.
Also, click on "This affects my team" and watch to receive future updates.
If the bug is not related to the issue you are facing, please, send us a screenshot of the affected labels, so we can test here using the same Labels.
We still don't know when the bug will be fixed since it will depend on the priority. Please, check our Bug Fix Policy for more details.
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