Hey! The customer care says the lounge access is for primary card holders only and add-on card holders cannot access lounge through their card alone in domestic or international.I am visiting on 30th Sept T2 080 Lounge.
Yes, Primary and Add-on share the same features.
No issues try swiping the card directly.
I wanted to check if you were successfully able to access the lounge directly on the add-on card?