QB Issue Resolution:

Under file, there should be Tools, Import. As you walk through it should take you to the point you ccan open the default template. It has a page for Customers.

Resolution for Issue 'Importing customers into Point of Sale Pro' available: Yes (Solved).
Source: Intuit Community forum.

Importing customers into Point of Sale Pro: 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.

Support for Import
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Error Recovery for Import [Canada]
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