Sure. We are using JIRA cloud. The board currently is grouped by assignee. If I add an issue to a different user, I get the above message. If I refresh the page, the issue exists and can be moved normally. I'm getting the same message as if I create an issue assigned to me and move it to someone else.
You mentioned assigning it to a different user. Does this happen when you assign it to yourself?
If I assign it to myself, the issue is created with no error. However, if another user assigns the task to himself, the error appears.
Can you share the JQL query you’re using to define the Board/Quick Filters?
I'm not sure the new Agility board allows me to see the JQL query that Atlassian creates. I haven't created any quick filters
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