Dadd4:   20022x
G:       32003x
Em7:     02000x
A:       x0222x

For a cool effect you can add the high e string from verse 2 onwards

These chords fit what the piano plays and also works on guitar
On Instagram however Davie posted a video where he played these three chords:
050030, 040030 and x2001x (the root note is a hammer-on in the last chord). 
All with the capo on the 5th. It's in Open D Tuning
Maybe someone else can work out that version

You can remove the high e string from your guitar to make it easier

[Intro]
Dadd4 Dadd4 Dadd4 Dadd4


[Verse 1]
Dadd4
Morning breaks

It's a sobering take
        G             Em7
But I'm here, you are not again
Dadd4
This time of year, I usually lean on
   G                         Em7
My closest friends, secretly hoping
     Dadd4            G    Em7
That you'll be coming back here


[Chorus]
Em7     A             Dadd4
I don't mind, I don't care
        G
I don't need your love
Em7
No, maybe I never did
     Dadd4
I am strong

And I belong
        G
To this world and if I cannot belong
   Em7                 Dadd4
To anyone then I'll confine
                             G
In the quiet winter, light a gathering
           Em7                    G
And I hope you find some peace of mind
     Dadd4
This Christmas, hopefully

[Interlude]
Dadd4 Dadd4 G


[Verse 2]
       Dadd4
It was Christmas night, back in '99
    G                     Em7
You went out, no one knew where you went
                  Dadd4
And I've spent my whole damn life
          G    Dadd4  Em7
Trying to find you


[Chorus]
Em7     A             Dadd4
I don't mind, I don't care
        G
I don't need your love
Em7
No, maybe I never did
     Dadd4
I am strong

I belong
        G
To this world and if I cannot belong
   Em7                 Dadd4
To anyone then I'll confine
                             G
In the quiet winter, light a gathering
           Em7                    G
And I hope you find some peace of mind
     Dadd4
This Christmas, hopefully


[Interlude]
Dadd4 Dadd4 G G
G Dadd4 Dadd4


[Chorus]
Em7  A          Dadd4
I do mind, I do care
        G
I still need your love
                        Em7
And the truth is that I always will
        A           Dadd4
I'm not strong, I belong
        G
To this world, and if I cannot belong
   Em7                 A
To anyone then I'll confine
                             G
In the quiet winter, light a gathering
              Em7                G
Hoping you'll find some peace of mind
     Dadd4
This Christmas, hopefully