He is not a member to/of our team.

1. He is not a member to our team.

2. He is not a member of our team.

3. 1 and 2 are both correct.

I wonder which preposition is correct for this sentence.

I think whether "to" or "of", they seem to sound all natural, so I'd choose 3 as the right option.

What do you think?

It's a sure thing that "to" can be used like that, given this expression "that is all there is to this"