Why is "Two Princes" in G Major ?

Hi guys,

Started learning music theory recently, at the moment looking at how to identify which key a song is in.

Tried the usual method on the song "Two Princes" by Spin Doctors (first, last and most used chords, chords you want to resolve the chord progression with, and playing the minor/major scale of the corresponding tonic tone on top of it).

This tells me the song is in the key of D Major (first chord is D, you want to resolve the chord progression with a D, and the D major scale works well on top of the song; also seems the melody for the lyrics is made with the D Major scale).

Looking the song up on the internet, it seems the consensus is that the key for the song is G Major. Which I find bugging as, for example, the G Major scale does not sound right with the song.

I assume I am missing something obvious here ?

Exemple : https://tunebat.com/Info/Two-Princes-Spin-Doctors/0cuq829zRNq4AEdmDJA4aw