Avoiding QuickBooks Errors During Importing Lists
When importing customers, vendors, or employees into QuickBooks, make sure your list doesn’t contain duplicate names. This is one of the most common causes of Error 3100. Pre-cleaning your spreadsheets or using QuickBooks’ built-in import tools can save you from frustrating errors and prevent future syncing issues across platforms.
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QuickBooks Error Code 3100 - HackMD
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QuickBooks Error Code 3100 - HackMD

QuickBooks error code 3100 appears when you attempt to add a new client. The created customer request already has the name or information you are attempting to enter for the customer, vendor, or employee.