QB Issue Resolution:

To add a blank line on an invoice, just add a few spaces (click on your space bar on your keyboard) under description. Then you can enter more lines below that, and it will show a blank line.

Resolution for Issue 'Adding blank lines to invoice' available: Yes (Solved).
Source: Intuit Community forum.

Adding blank lines to invoice: 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 Invoice
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Error Recovery for Invoice [Canada]
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