MTD Token Renewal

I am having trouble refreshing my MTD VAT token. Once I get the token, I try and register the access token with HMRC but I keep getting the error message 'The underlying connection was closed. An unexpected error occured on a send.' Our IT Department thinks that the problem persists with HMRC and there is no issue at local level. Anyone have any ideas how we may resolve this?

Hi,
Please contact our Helpline as below:
VAT: general enquires.
Thank you.