My payment is being declined from NHS United Kingdom Covid testing page

My booking for a Covid test is being declined every time I use my Niyo SBM card on the UK government’s NHS Covid testing page. Could you please confirm and let me know why is this happening? The link for the site is as follows

quarantinehotel.ctmportal.co.uk/Quarantine/Home.aspx

@Mayur_Sukheja you’d want to check your card settings and enable international transactions and online transactions. They’re disabled by default. If the issue still persists, raise a ticket from within the app support