Hello @qcknuser,
Thank you for reaching out to the Quicken Community, though I do apologize that you are experiencing this issue.
Before I can further assist you, I require some more information. Is this occurring with downloaded transactions? If you don’t mind, could you please provide a screenshot of the error message you described receiving? 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.
I look forward to your response.
When this happened to me years ago, I phoned the bank and they were able to change their e-check numbering sequence for my account. You could ask them not to send numbers at all, but I don't know whether that's possible. There's nothing Quicken can do about it.