This message means your instance has exceeded the max rank value length (255) and now is performing a blocked balance. The best approach here is just wait for the load balance to end, and then you will be able to use your Agile boards as always.
If this takes too long, I would recommend to reach Atlassian Support to help you with your specific case.
I’m a designer on the Jira team. For a long time, I’ve fielded questions from other designers about how they should be using Jira Software with their design team. I’ve also heard feedback from other ...
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