An unexpected error occurred. Please ensure that you are making a valid request and try again later. this type of error show at the time of MTD vat.

I know it's time-consuming to go through all these hurdles when doing your QuickBooks tasks, Shubham. I'm here to share an update about this matter.

Currently, we have an ongoing investigation about the Error message: An unexpected error occurred. Please ensure that you are making a valid request and try again later in QuickBooks Online (QBO). Rest assured that our engineers are aware of this matter and are diligently working on a fix so you can get back to business seamlessly.

We recommend contacting our Customer Support Team so they can add you to the list of affected users. This way, you'll receive email updates about the investigation's progress and get notified as soon as it's resolved.

Here's how to contact support:

1. Sign in to your QuickBooks Online company. 
2. Select Help (?).
3. Click either tab to get started: Assistant or Talk to Human.
4. Search Contact Us, then Start a chat with a support expert.

Please ensure to review their support hours to know when agents are available. This way, you can contact them at a time that is convenient for you.

I'm adding this article you can read to learn how to adjust your VAT liability, what happens after you make a VAT adjustment, and key things to remember before you submit a VAT return: Make VAT adjustments in QuickBooks Online.

Thank you for being a part of the QuickBooks community. If there is anything I can assist you with MTD VAT-related, please don't hesitate to comment below. I'm always here to help you. Have a great day ahead!