This is most likely happening because the email you're trying to access has been moved, archived or deleted. Why is the Outlook add-in asking me to log in to my Microsoft account, when I try to access an email through a Todoist task? If you remove permissions for the Outlook add-in, you will not be able to use it until you allow the add-in to access your information. If you were using a work or school account, you can manage your permissions in the My Apps portal.

If you were using the add-in with a personal account, you can manage permissions in your Microsoft account settings. The method for removing permissions depends on the type of your Microsoft account. How can I remove permissions for the Outlook add-in to access my Microsoft account information?

Under the Todoist icon, click the three dots icon.

Click My add-ins in the left-hand menu.

At the top of the email view, click the three dots icon.

If you no longer want to use the Outlook add-in, here's how to remove it: No, it’s currently only possible to add a due time while in Todoist. Can I add due times to my tasks when using the Outlook add-in?

If you’re using an older version of Outlook, you can instead use the add-in by opening Outlook in a browser. The Outlook add-in supports Outlook 2019 or later on Windows, as well as Outlook 2016 or later on macOS. Can I use the add-in on older versions of the Outlook desktop app? Delete OutlookTodoistADX from the list of your apps. Please follow these instructions to uninstall your legacy plugin.

Microsoft to do open in outlook desktop