QB Issue Resolution:

Export the Customer List. Open it in Excel and delete everything except the Header and the info regarding this one customer.

But really, you could have manually entered all that info, already.

Resolution for Issue 'I’ve been looking for info on how to export just one customer record to an IIF file so I can import that customer into the new company file. Is that a thing that can be done?' available: Yes (Solved).
Source: Intuit Community forum.

I’ve been looking for info on how to export just one customer record to an IIF file so I can import that customer into the new company file. Is that a thing that can be done?: 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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