QB Issue Resolution:

I suggest to call our Technical Support and asked to be transferred to our Level 2 Specialist. Once confirmed and validated, we are going to submit product defect to our product engineer.
To reach our support, you have to go to http://intuitcar.es/contactquickbooks. On the next page, you’ll be asked to select the topic that best describes your issue and the number to call can be found by clicking the View Contact button.

If additional support is needed, please let me know.

Resolution for Issue '“Your Forms were not sent because QB’s could not create the necessary PDF files”' available: Yes (Solved).
Source: Intuit Community forum.

“Your Forms were not sent because QB’s could not create the necessary PDF files”: 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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