https://uidai.gov.in/en/my-aadhaar/about-your-aadhaar/aadhaa...

This is what I referred. But never come across a situation where it was followed. Many cases were not progressing without aadhaar.

Good article about the woes in India to preserve privacy amidst the combined onslaught of government surveillance and surveillance capitalism. My mother's pension account was frozen for many months for not providing her Adhaar Id. I had to finally threaten legal action to ensure she could access her bank account again. We were lucky that we were well-off and my mother could live without her pension for many months, but such actions can make the financially-constrained really desperate.