What is address of tax residency in nps?

This question is a bit confusing, yes. 'Tax residency' is about the country where you have to pay tax. It is not always your citizenship country. If you live and work in Canada, then your tax residency is Canada.

So, for the NPS form, you should use your full Canadian address.

They ask this for some international tax rules. This is to stop people from hiding money. It is very important to give the correct information. Do not put your Indian address if you are a tax resident in Canada. I hope this helps you.