how to reedem the code on apple tv app on my smart TV

See: Target Circle™ Partners - Target. A Target Circle account is required. An Apple ID account with payment method is required. You have to link from the Redeem Now button on the Target site.

Hey chkish,

It appears you're having an issue redeeming a code for an Apple TV+ subscription. Check out the following article to see if the applicable steps inside may help: If you can't redeem your promotion for an Apple subscription - Apple Support

Take care.