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I receive the following message when opening a pptx file: PowerPoint couldn't load the add-in "/Users/
francescopastoressa/Library/
Group Containers/
UBF8T346G9.Office/User
Content.localized/
Startup.localized/PowerPoint/ SaveAsAdobePDF.ppam".
the answer provided here worked for me: https://answers.microsoft.com/en-us/msoffice/forum/all/de-selecting-add-in-in-ppt-when-the-add-in-fails/c6c00b6a-860d-4ad8-8fdb-2d49a9d4983f