QB Issue Resolution:

Please learn from the input here.

 

There is One More Setting:

Edit menu > Preferences, Send Forms, My Preferences tab. Here you see that you need to Checkmark:

“Auto-Check the “Email Later” checkbox if customer’s Preferred Delivery Method is Email.”

Resolution for Issue 'Printing & Emailing Invoices' available: Yes (Solved).
Source: Intuit Community forum.

Printing & Emailing Invoices: 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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