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Ensure that your page renders without any issues in the “View as published" mode (for example, http://localhost:4502/content/wknd/language-masters/en/errors/404.html?wcmmode=disable). If there are any issues, the preview in XTM Cloud simply will not work as the page will not render at all. The configuration on the AEM side needs to be corrected.
Check if you can create a manual preview archive by appending the following suffix to the page: “.xtmpreview.zip” (for example, http://localhost:4502/content/wknd/language-masters/en/errors/404.xtmpreview.zip). If there are any issues, contact the XTM International Support team, by creating a suitable ticket, and provide logs from the operation described above. To learn about AEM logs, make sure to read the following article: AEM: Where are logs located and what information do they contain?.
Check if the preview in XTM Cloud produces the expected outcome by unpacking the archive and displaying it on a local web server. Running it directly without Apache will not work due to the use of absolute paths in the files.
Run the translation project with a single page. Start it and wait for the preview file to be sent over to XTM Cloud. If there are any issues, contact the XTM International Support team, by creating a suitable ticket, and provide logs from the operation described above, as well as the generated ZIP package from item 2.