Hi @David_M_Kassin, please try to install the Outlook add-in from this link.
Please note the Asana for Outlook add-in is not available for personal accounts. It can only be downloaded for your work email address. An Office 365 subscription is also required to use Asana for Outlook. In addition to the Outlook Web App, we support the Outlook 2016 desktop app.
If the issue persists and you have all the requirements, I recommend you contacting our support team and confirm you have the requirements above:
I hope this helps!