Hello there. I understand the urgency of filing your VAT return as soon as possible. I'm here to share some troubleshooting steps that will help you sort things out.

In this case, we can perform the Verify and Rebuild tool troubleshooting process. Doing this will also give you a better experience and fix unusual issues in your account.
 

Here's how:
 

1. Go to the File menu, and select Utilities.
2. Choose Verify Data, then tap OK to close all windows. If you see “Your data has failed the integrity check”, you'll need to rebuild your file. If there are no problems with your data, you’re done.

If there are problems with your company file, you'll have to rebuild it.
 

1. Go to the Files menu and select Utilities.
2. Choose Rebuild Data, and then click OK.
3. Tap OK to make a backup to prevent data loss along the process.
4. Hit OK to continue the rebuild process.
    

For more insights about the verify and rebuild process, you can check out this article: Verify and Rebuild data.

Once everything looks good, you can proceed with filing your VAT returns in QuickBooks Desktop. You can refer to this article for a step-by-step process: Submit a VAT return to HMRC through MTD for QuickBooks Desktop.

Please tap the Reply button if you need anything else. I'll be around. Take care always!