Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Refer the following link where the same issue is discussed. Check if that helps.
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Microsoft Office Standard 2007 encountered an error during setup.
Error 25004.config.xml not specified;a valid config.xml file must be authored when deploying '(null)'.
Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
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Refer the following link where the same issue is discussed. Check if that helps.