GST refund paid as estimated tax liability

Hello Friends,

Application for GST Registration as a casual taxable person got rejected. Estimated tax liability paid while applying for registration. 

While applying GST Refund under "Refund of excess balance in electronic cash ledger", when we submitting the application, it asks for aadhaar authentication. Aadhaar authentication link not working, it gets struck in that page.

Aadhaar authenticated already during registration application.

Now, how to get refund for the amount paid as estimated tax liability?

Thanks in advance.