Moving from QBDT to QBOL. I keep setting up / authorising MTD - successfully. But then get a Cannot connect to MTD (try in another 72 hours) error. WHY ?

Hello there, S400.

I recognize how important for your business to have accurate records of your books. This ensures you're on top of filing your forms and taxes. Let me direct you to the right support that can address your concern on time. 

Since you've already submitted the VAT return in QuickBooks Desktop (QBDT), I advise contacting our QuickBooks Online (QBO) Team for further investigation. One of our specialists will review your account, particularly the filed forms. They'll also discuss in detail how to handle the situation.

To get the support details:

1. In your company, navigate to the Help icon at the top to display the Search window.
2. Click the Contact Us link to access the What can we help you with? section and then enter a brief description of your concern in the field box. For example, errors when 
3. Tap the Continue button to see the list of support options.
4. Choose Chat to start a conversation or Callback to speak with an agent.

I've included a few helpful links with information on how to fix filing issues and answers regarding the most recent Making Tax Digital (MTD) improvements:

• Everything you need to know about Making Tax Digital (MTD) for VAT with QuickBooks Online
• Fix MTD issues and errors in QuickBooks Online

You may want to save the following link for later use: Get started. It includes topics and resources that will guide you on how to handle any QuickBooks processes efficiently.

Don't hesitate to visit the Community if you have other product-related concerns or additional questions about submitting your tax return. I'll get back to make sure you're taken care of. 

You should not have to resubmit the VAT Returns @S400 - just Mark as Filed on each one.

(from memory, it's a dropdown on the Send to HMRC button)

Hope this helps.