Why Apple Intelligence doesn’t working in India?

According to Apple:

Some features, additional platforms, and support for additional languages, like Chinese, English (India, Singapore), French, German, Italian, Japanese, Korean, Portuguese, Spanish, Vietnamese, and others, will be coming over the course of the next year.

All the best! 👋🏼😉

How to get Apple Intelligence - Apple Support

See the section on Supported Languages.

Apple is selling the iPhone in India so you can make and receive calls, send and receive messages, and run the thousands (if not millions) of apps. Other features will arrive in the future, as is always the case with such devices.

Regards.

What is your language setting?