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Thats all, your embedded issues and filters are visible on your shared pages.
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Error codesmessages:
001 - request Request was malformed
002 - External Share for Jira is not installed in Jira instance
003 - Could not access Issue / JQL / Board Issue might not exists. Issue is fetched as user who created Confluence page or edited Confluence page. If this person has no access to issue then it will not be displayed.