Hi @Anne Rivers ,
Welcome to our forum!
How did you add the Gmail account in New Outlook for Windows? As mentioned in this article?
And would you please provide more information about the error for our better research? Just like a screenshot. (In order to avoid privacy leakage, please remember to hide your personal information.)
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.