Not getting dropbox option even though I qualify

I need to renew B1/B2 visa expired in 2020. However the cgi website is not giving a dropbox option.

  • previous visa is also b1/b2
  • issued in India
  • after Jan 2008 (issued in 2010)
  • after 14 birthday (15 years)
  • no annotation

Have I made a mistake in the application ?