I'd like to help get this one sorted out.
You'll need file your sales tax return outside QuickBooks Online since this must have been filed anytime between the 1st and 18th day of the month.
To record the payment and get a copy of the return, you can follow these steps:
For future reference, you can go to the Viewing Return status and Completed Returns section in this article: E-filing and Payments for Sales Tax.
Feel free to leave a comment below if you have further questions. I'll be more happy to assist you.