doesnt have truetone

Hello. The iPhone 11 Pro Max supports True Tone. If you would like to turn on True Tone, you can do so at Settings > Display & Brightness > True Tone. If True Tone is unavailable, it may be disabled by an accessibility setting such as Invert Colors, Grayscale, and Increase Contrast.

Did you replace the screen, or have it replaced by someone other than Apple? That’s the most common reason for losing True Tone (and also automatic brightness).

Check Settings → Display and Brightness. If your device supports TrueTone, the option will be just below the brightness slider. If the option isn’t there, then your device doesn’t support TrueTone.

You might find this article helpful in regards to what phones support truetone, and what might disable it.

Adjust the brightness and color temperature on your iPhone, iPad, or iPod touch - Apple Support

You can use True Tone with these devices: iPhone 8 and later,

In addition to that, some accessibility settings will disable truetone.

And if you have replaced your screen at a third-party repair shop not affiliated with apple it might also be disabled.