“Indigenous” seems to be acceptable most people. When you know them personally, use their nation or tribal affiliation. Like if your friend was Korean, and you only referred to them as “Asian,” it might feel like you don’t care about the difference.

Different people prefer different nomenclature, but the generally accepted standard has switched from native American a couple decades ago to American Indian now. IIRC the change happened because calling people natives sometimes seems synonymous with calling them primitive. Most US tribal groups use American Indian now

20 years ago it was “native, aboriginal, or first nation’s” people

Not sure which is the current flavour

Depends on your country. Really every place has come up with something different: First Nations, indigenous, native, etc.

Native, I would assume