It has puzzled me since taking delivery of my 2020 Autobiography earlier this year. It could just be me but with the front headrest in their most forward position i have to tip my head a long way back to make contact with the headrest. Am i missing an adjustment somewhere or is this the norm as it seems in their present position they are functionally useless. Agueroooooooooo. 93-20
I swear you will never see anything like this ever again....watch it..drink it in.

I noticed the same when I compared my AB with my previous 2019 Vogue SE, in that, the headrest was just there, right where you needed it.

Unnecessary quote removed

I believe the uppermost seat adjustment button is for the headrest. You can raise/lower or even move the headrest away or towards your head.

 19MY SVA-Dynamic Spectral Chromoflair Blue but colour not available in profile
2016 RRS SVR Estoril Blue - Gone
2010 RRS 5.0 Supercharged Navara Bronze - Gone
2008 RRS 4.2 Supercharged Black - Gone
2006 RRS 2.7 Diesel Rimini Red- Gone

With it fully forward, it isn't quite far enough. Its a strange one.

I have exactly the same niggle, I have tried everything and the headrest is just too far back. ------------------------------------------
L460 D350 73 24 model FFRR Autobiography Santorini Black with Shadow Pack
L405 4.4 V8 18 FFRR Autobiography (facelift) Santorini Black with Shadow Pack
L405 3.0 V6 13.5 FFRR Autobiography Santorini Black
L322 4.4 V8 12 FFRR Autobiography Santorini Black (RR Styling Pack)
L322 3.6 V8 10 FFRR Autobiography Santorini Black
L322 3.6 V8 07 FFRR Vogue SE Santorini Black
L322 3.0 I6 55 FFRR Autobiography Santorini Black

So I am not the only one. that is good to know... SDV8 AB MY 2020
MINI Cooper S Cabrio
Kit: Jaguar XK140 (in progress - the website is link to build)

I don't seem to be able to adjust my headrests back/forward, just up/down - I also find them too far back, I have to tip my head backwards to reach them, and I drive with my seat quite upright too. FFRR SDV8 Autobiography