Once the DRC-01B Part A is generated, a reference number will be assigned for the same. An email and SMS notification containing these details will be sent to the email address and the mobile number registered on the GST portal. Check your registered email address and mobile number regularly for notifications regarding DRC-01B Part B.
You can also check for the notification on the GST portal. Navigate to Services > Returns > Return Compliance > Liability Mismatch DRC-01B.
and GST filing.