Accidentally entered a wrong number for HMRC authorisation. Wont let me try again?

I appreciate you reaching out, Beach. Since you're unable to re-enter the number for HRMC authorisation, I recommend contacting our live support team for further assistance.
 
As much as I'd like to assist you directly, our live experts can review your account in detail and help correct the HMRC authorisation setup so you can re-enter the accurate information. 

They can also guide you through any additional troubleshooting steps if needed. To reach them, please follow these steps:  

1. Go to the Help icon, then select the Search tab.
2. Click Contact Us.
3. In the box provided, describe that you accidentally entered the wrong number for HMRC authorisation.
4. Hit Continue and then choose the Callback option. 

Please refer to this article for our available support hours: Get Help with QuickBooks Products and Services.

For additional guidance on setting  up HMRC authorisation, check out this article: Set up MTD for VAT in QuickBooks.

If you have any further questions, let us know below. We're always here to help.