.dll is not a valid office add-in

  • Thread starter Thread starter net_tech
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net_tech

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Trying to add an Outlook Add-in to Outlook 2016 / 16.0.4849.1000 32bit on Windows 10 / 1903 under a test user generates an error shown below.

The Add-in was built on the same computer under a dev account. Dev account is a member of local users. When running the code from Visual Studio the add-in gets added to Outlook without any issues. The project was compiled and the entire Debug folder was given to a QA user to test installation.

Both users have the same rights on the system.

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