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I can't export a PDF file into excel.
As mentioned above that you are trying to Export the doc, so make sure that you have installed the correct application which is Adobe Acrobat Reader DC not the Acrobat DC.
Try Signing Out and from the application and Sign In again.
Adobe Acrobat Reader DC Install for all versions
As Adobe Export PDF is an online service, so you may Sign In online via https://cloud.acrobat.com/exportpdf and check if you can do the conversion.
You need to use the same email address for Sign In under which you have registered Export PDF.
Let us know if this doesn't help.