I am having the same problem. I have two companies with payroll accounts that have different EINs. I was getting the same error code on both when trying to update payroll info. I have both companies set up for automatic updates. I did a manual update even though there were no new updates available. I was then able to update the info for one of the companies but still gettiong the 400001 error code when I try to update the other. The quality of customer service provided by Intuit Quickbooks has declined dreadfully. I hope this issue is resolved soon.
