QBO's new bill pay is wonky. Checks sent out do not have the vendor account number on them so I have had checks returned to me saying they don't know what account

You can signup for a free Melio account to integrate with QBO as a workaround. They use USPS to send checks with regular delivery time of 5-7 days. If you need to pay your vendors/contractors faster, you can use their Fast Check option (+ flat fee $20) and will be sent in 3 days via FedEx. Another strong point, you can easily void the check anytime in the app. QB Billpay ignores this important feature.

https://affiliates.meliopayments.com/quickbooks

You can also get $100 cashback to pay the first bill.

https://affiliates.meliopayments.com/cashback

I understand the significance of this functionality to your business, miles. 

We value your time with us. Thus, I recommend submitting feedback. This way, we can enhance your experience with us, and will be shared with our Product Development team.  

Here's how:  

1. Select the Gear icon, then choose Feedback.
2. Enter your comments or product suggestions.
3. Click Next to submit.

Additionally, you can browse this guide to learn how to set up automatic payments for recurring invoices: Set up Autopay for recurring invoices in QuickBooks Online. 

Please let me know if you have more questions about Bill Pay management. I'll be here to lend a hand. Keep safe always.