"Outlook 365 is updated and current"

Is that installed Locally? Because "365" is web-based and not a Windows email Client, unless it is installed as if it is Outlook 2016 or whatever it would be as the Desktop client.

https://proconnect.intuit.com/community/manage-passwords/help/email-your-client-s-tax-return-as-a-pa...

I have not found anything more current than:

• Unsupported Email Applications:
  
  • All web-based versions of Outlook, Outlook Express or Windows Mail
  • All webmail services (such as Outlook.com, Outlook 365, Gmail, Yahoo, AOL, etc.)