My customers transactions keep failing. It says try again or contact the seller. It's not every customer. I have all the setting enabled accordingly. What's wrong?

I appreciate your effort in reviewing your setting and checking your parent's account to verify where the issue is coming from, Zachary. Receiving customer payments fuels the business, so I'll point you to the right support team for assistance.

Since the error affects your customers' transactions, I recommend contacting our representatives. They can securely access your account to conduct further investigation. I'll show you how.

1. Navigate to the Help icon at the top right-hand corner.
2. Select Search, then press the Contact Us button.
3. Enter your question in the box and hit Continue.

Please note our support hours and availability on this article: QuickBooks Online Support.

You can share this reference with your customers so they'll know their options in the meantime: What to do if your customers can't pay their invoices online.

Ask further sales matters that come to your mind by replying to my post. Recording settlements or managing customers' concerns are welcome.