Does the user also have the "Schedule" and "Edit" issue permissions in the project permission scheme. As mentioned here-
https://confluence.atlassian.com/agile/jira-agile-resources/jira-agile-faq/what-are-the-permissions-used-in-agile-boards
Also, is the board fetching issues from only 1 project or multiple. If it's multiple projects then the user needs to have the right permissions across all the projects.
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