QB Issue Resolution:

QBO does not create or store bar codes for anything, you will have to use third party software like Zebra or something.  There are free bar code generators on the net, google for it.

a bar code reader is a substitute for a keyboard, it reads the code and translates it to alphanumeric codes that are sent to the software just as the keyboard does.  If your bar code translates to the item name, then that will come up when you scan a code.

Resolution for Issue 'How Can i connect barcode reader and label printer to QB to add my own barcode to my products?' available: Yes (Solved).
Source: Intuit Community forum.

How Can i connect barcode reader and label printer to QB to add my own barcode to my products?: 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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