QB Issue Resolution:

I will be happy to help you find customer info.

To find information for deleted (inactive) customers:

Click Customers on the left panel.
Click the Gear at the top right of the list, just above the word Action.
Check the Include Inactive option.

Inactive customers will now show with (deleted) after the name. Click a customer name to open the customer record and select Customer Details at the top.

Resolution for Issue 'how to access former customer information?' available: Yes (Solved).
Source: Intuit Community forum.

how to access former customer information?: 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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