QB Issue Resolution:

customer names with no transactions – in QBO use menu gear>import, click custmoers then click the link for a sample formatted import excel sheet.  Use that format to list your customers

in desktop you can use the menu file>utilities>export>lists to iif to get an excel file for customers, or what you choose

Resolution for Issue 'how do i import customers from on line to desktop' available: Yes (Solved).
Source: Intuit Community forum.

how do i import customers from on line to desktop: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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