QB Issue Resolution:

For now, you can only enter the amount in numbers in the Amount field. You might want to indicate the amount in words in the Memo field.

 

We can send a feature request to show the amount due in words. Most of our new product enhancements are based on customer suggestions sent to them. Just go to the Gear icon and look for Feedback.

Resolution for Issue 'How to have the amount due in words appear on an invoice' available: Yes (Solved).
Source: Intuit Community forum.

How to have the amount due in words appear on an 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.

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