QB Issue Resolution:

It’s not sent until you send it. “e-mail later” merely sets a reminder that you have not yet sent it.

Resolution for Issue 'When is an ’email later’ invoice actually sent?' available: Yes (Solved).
Source: Intuit Community forum.

When is an ’email later’ invoice actually sent?: 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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