If you want to see the full card number there is a workaround but beaware it's a lengthy process
Go to Yes Bank online -
https://yesonline.yesbank.co.in/index.html?module=recovery
Click on forget login id.. it will ask to enter the customer I'd.. click know your customer I'd option as shown in screenshot.. enter mobile number and dob to validate and get your customer I'd
Once you get your customer ID.. go to yesbank iris and login with aadhaar number.. it will ask for aadhar number and customer I'd to login and view your card details there.