The Confluence Page Embedder web part has to match the SharePoint Connector version installed in Confluence. After you update the app in Confluence, update the SharePoint package too.
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Open the app configuration in Confluence and check that the correct SharePoint address is set.
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Download the current package from the configuration page.
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In the SharePoint App Catalog, replace the existing app with the new package.
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Reload the SharePoint page with the web part (Ctrl+F5).
Related: Download Confluence Page Embedder and Deploy Confluence Page Embedder to the SharePoint App Catalog.