My friend is having the same issue with her quickbooks account, but what you described here is not a solution to the question that was asked. The initial post was in regards to the CT registration number, not the CT Account Number. Connecticut updated the format of their new Registration numbers several years ago, and Quickbooks has yet to allow the new format. Quickbooks developers needs to either create a new field to accept the new format, or adjust the field they already have. Either way, it needs to be addressed immediately!