Kotak 811 support informed below merchants are blacklisted and are not eligible for cashback:
Amazon
Flipkart
Phonepe
Freecharge
Sbi Unipay
Bharti Airtel
Paytm
Airtel money
Amazon pay
Bajaj finance
GPay (Insurance, Utilities, etc)
Mobikwik
Are they really not eligible?
Also, below merchants...