Hello @Dave Robinson,
Thank you for reaching out to the Community and telling us about this issue. I'm sorry to hear you're running into this problem. What is the specific error message and error code? Are you able to include a screenshot of the error you are getting (with any personal information obscured or blurred)? If needed, please refer to this Community FAQ for instructions on how to attach a screenshot. Alternatively, you can also drag and drop screenshots to your response if you are not given the option to add attachments.
Thank you.
Thank you for your reply,
If you haven't already done so, I would recommend backing up your file, then following these steps from this article:
Deactivate all accounts for this financial institution, then force Quicken to "discover" all available accounts:
If the account was closed, deactivate it from future online updates