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I've checked our files to see if there's an open investigation, Ocmkt. I found none. Let me help you email the invoices.
I'll share a few possible why you're unable to send the transaction:
First, let's make sure QuickBooks is updated to the latest release. Our program periodically provides release and updates to fix emailing concerns and add new features.
Then, let's check the email preferences. Here's how:
Once done, you can try to send the invoices to your customers.
Although, if you've encountered an incorrect password message, I'll provide you the article with the steps to fix it.
You can keep in touch if you need more help from this.