I wish I could make it better, @cpjelectrics.
Since you still receive the same error message even after performing all those steps, I'd recommend contacting our Customer Care Support. They can pull up you're account, securely, and create a case or ticket ID to be submitted to our engineers for further investigation about this unexpected behavior.
- Go to Help.
- Tap Contact Us.
- Enter Unable to send an invoice with an error message in the What can we help you with? field.
- Click Let's talk.
- Select Get a callback, Chat, or Call us.
Lastly, I've got you these helpful articles you can read for ideas about how you can manage your vendors and expense transactions: Manage Customers and Income for QuickBooks Online.
If there's anything else that I can help you with, let me know in the comments. I'll be happy to help.
