Hi , like the title suggests , I am unable to enter tracking numbers and confirm dispatch of business orders only , all other orders are fine , error code with exclamation mark error on the shipping page is

Dispatch from:

Invoice by Amazon orders can only be shipped from locations where you have a valid VAT registration number. Go to 'Shipping Settings > General Shipping Settings' to add a valid default delivery address in your VAT registered country.

Never had this problem before and have valid VAT number registered and valid default delivery address hasn't changed and always worked for over 10 years. Cant open a case with amazon about it either .

Urgent help needed.

Thanks