Hello Takhdeer,
We'd like to provide you with a few steps that may be able to assist you with redeeming your Apple Music free trial:
"How to redeem your offer:
1. Make sure your iPhone or iPad is running the latest version of iOS or iPadOS.
2. Pair your eligible audio device to your iPhone or iPad.
3. Open the Apple Music app on your iPhone or iPad and sign in with your Apple ID. If the offer doesn't appear immediately after launching the app, go to the Listen Now tab where it will appear.
4. Tap Get 6 months free."
You can follow this link and select "Get Started" option: Get Apple Music free for 6 months.
If you can't redeem your promotion for an Apple subscription, follow these steps:
1. "Make sure that you're eligible
To see if the promotional trial is still current, visit apple.com/promo. Most offers are available for only a limited time. To make sure that the device or subscription that you purchased qualifies for the offer, read the terms and conditions.
If your offer isn't listed, it might have come from another company. Contact that company for help with redeeming the offer.
2. Check if you or a family member already redeemed the offer
If you or a family member already redeemed the offer, you can't redeem it again.
3. Update the software on your device
Update to the latest version of iOS or iPadOS, macOS, watchOS, or tvOS. Then try to redeem the promotion again.
4. Sign in on the eligible device
To redeem some promotions, you need to sign in with your Apple ID on the eligible device. Then try to redeem the promotion again.
If your eligible device is a Mac and you've just set it up, you might need to wait at least 4 hours for the offer to appear.
If you're still unable to redeem your offer, we suggest that you reach out to Apple directly. You can follow this link to connect with them: Get Support
Thanks for connecting with Apple Support Communities.
Take Care.