Where can you check the credentials for MTD to submit VAT Returns?

Hi there, wendy-clydesdale.

Let me provide you some information about your concern.

Normally, QuickBooks will not save your credentials when submitting MTD to HMRC. With that, I would recommend getting in touch with HMRC as they take charge of handling this kind of situation. You can also seek an advice to your accountant to get the correct way on how we can check your credentials.

About submitting the VAT returns within the Online product, you can check out this article: Submit a VAT return in QuickBooks Online. 

I'm always around if you have additional questions. Take care, and stay safe!