I can help you set up the correct income account in QuickBooks Online, @bgoon.

Firstly, you must delete the existing invoice to successfully correct its income account. To do so, here's how:

1. Go to Sales menu located from the left  navigational panel, then select Invoices. 
2. Find the specific invoice.
3. Under the Action column, click the dropdown button, then Delete.
   
   

Once you've turned on your Make expenses and items billable from your Expense tab, your Chart of accounts will automatically set up as Billable Expense Income. If you want to change this, you can go to your Accounts and settings, then select your preferred account to ensure your invoices will go to its correct account. Please follow the steps below to complete this process:

1. Go to the Gear icon, then Accounts and settings. 
2. Navigate to the Advanced menu, then Chart of accounts section.
3. Click the pencil icon, then from the Markup income account select the appropriate account. 
4. Hit Save and Done.
   
   

Afterward, recreate the deleted invoice and make sure to add the billable expense from the Suggested transaction. To confirm if the invoice is located at the right account, you can check it from your Chart of accounts. Here are the steps you can follow:

1. Go to the Gear icon, then Chart of accounts. 
2. Find the accounts, then Run report. 
3. Verify if the invoice transaction you've created is there.
   
   

You can also refer to this article if you want to view all bill payment voucher in QuickBooks: Show all items on the Bill Payment voucher.

Feel free to get back to this post if you have other concerns about markup billable expenses in QuickBooks. I'll be around to help you anytime.