Hi @jadamar, welcome to the Asana Community Forum! There are some specific compatibility requirements to install the add-in, you can see more details below:
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Asana for Outlook works with most versions of Outlook that allow add-ins for Office: Outlook Web App and Office 2016 for Windows and Mac. It does not support Outlook 2013.
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You must have an Asana account and an Office 365 Commercial subscription. On-premises Exchange Server is not supported.
If you meet all the criteria, please try to install the add-in from this link: Find the right app | Microsoft AppSource
If the issue persists, I recommend you to contact our support team so we can investigate the issue further: How to contact our Support Team ✉
I hope this helps!