Visa appointment - First time H1b

My h1b started in 2020, I am trying to get my first visa stamping. On filing my DS-160 and paying the MRV fee, on cgifederal website I was eligible for interview waiver. However, on continuing it shows me “Schedule OFC Appointment” which leads to seeing Chennai, Kolkata, Mumbai, New Delhi, and Hyderabad VACs as my options. On choosing them, I always see “There are currently no appointments available.” Now I have been trying since early April with no luck in finding an appointment.

Am I doing anything wrong? Should I be interview waived for my first stamping? Or should I be seeing a calendar?

Would really appreciate if anyone has any idea! Thank you!

If you hold any US visa in past you might be eligible for IW, otherwise not.