Hi Eeshaan Srivastava,
Welcome to Microsoft Q&A!
Thanks for reaching out, and sorry for answering late—I was just assigned with this.
First off, congratulations on your new Acer Nitro V15 laptop! I understand you're having trouble claiming the 3-month Xbox Game Pass offer, and I know how disappointing it can be when a bonus doesn’t show up as expected.
However, for the fastest and most personalized assistance, I recommend visiting the official Xbox Support page for help with promotional claims!

If you have any other technical issues, feel free to let me know and I can help you with that. Thank you for your time.
Warm Regards,
Lychee-MSFT | Microsoft Q&A Support Specialist
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