We request you to follow the below mentioned channels to activate your Debit Card for international usage..
Internet Banking :
Login to www.icicibank.com with user ID and password > Go to Customer Service > Service Requests > Bank Accounts > Debit Card Related > Increase/Decrease Debit Card Limit > Complete your request by entering OTP sent to your registered mobile number and grid values of your debit card
Click here to navigate.
Mobile Banking:
Login to ICICI Bank iMobile Pay app > Click on Services > Card Services icon > Click on Modify Debit Limit > Enable International/Online transactions