If Not working from Yandex, Try This.

Update : Amazon ₹100 Cashback Coupon From Assistant Offer Still Wokring

Steps : First Download Kiwi Browser :

https://play.google.com/store/apps/details?id=com.kiwibrowser.browser

After Install > Login Amazon Account

Now Open This Link : https://chrome.google.com/webstore/detail/amazon-assistant-for-chro/pbjikboenpfhbbejgkoklgkhjpfogcam

Click Add To Chrome

After Complete Amazon Assistant Installing Click On This Link and Collect 100₹ Coupon : https://www.amazon.in/l/18316170031

ENJOY - you can try ! Worked in one account. may not work also