The following error is displayed when the page is rendered.
Error rendering macro 'portfolio-for-jira-plan'
It looks like you've entered a URL to a Jira that is not connected to Confluence. Contact your administrator to configure an Application link.
Seems straightforward enough. Except that there IS an Application link, because we use dozens of different Jira gadgets in our Confluence pages, and they all work fine. You can also paste the link https://******/secure/PortfolioRoadmapConfluence.jspa?r=OIAPo directly in the page, click it, and go to the report in question.
There is, as usual, absolutely nothing in the server logs.