Received email saying funds will be returned to customer but I linked my bank account and finished set up already. I need help to correct this please.

I can see the need in receiving funds on time so it won't create cash flow problems and other consequences that may happen. But don't worry, I'll guide you on how you can fix this and be able to accept payments successfully, WC.

There are times payment fails because of incorrect bank information or insufficient fund. 

Ensure to identify the rejected payment to determine where the failed payment is. To do so, follow the steps outlined below:

1. Select + New, then select Bank deposit. All the undeposited payments will show.
2. Look for the payment on the list.
3. Take note of the payment details.

Once done, create a service item for the rejected bank transfer. Here's how:

1. Go to the Gear icon and select Products and Services.
2. Select New and then Service.
3. Enter "Rejected bank transfer" for the name.
4. Enter "Bank transfer payment received rejected by the bank" for the description.
5. If the bank deposit is already deposited, select the bank account you deposited into for the Income account. Or if you haven't made the bank deposit yet, select Undeposited funds for the Income account.
6. Select Save and close.

Next, create an invoice to record the rejected payment. 

To know more about the process, check out starting from step 3 of this article: Fix Rejected Bank Transfer Payment In QuickBooks Online.

Furthermore, you can also learn more on the most frequently asked questions about QuickBooks Payments such as how you can manage payments, funding status, voiding or refunding payments and many more. I've added this article for more details: QuickBooks Payments FAQ.

You can always leave a comment below if you have any concerns with failed payments. I'm always right here if you need further assistance.