Pokémon GO AR+ doesn't work on my MI A1

The Pokemon GO camera feature called AR + does not work on my Xiaomi MI A1 phone - with Android One OS - since it was released.

This option simply does not appear in the options.

Does anyone know what I can do to fix this?

Showing how my screen looks:

Showing how the screen should look:

Solution 1:

From Niantic support page, Android devices must meet two requirements for AR+ to work

• Running Android 7.0+
• ARCore Support

If your device supports ARCore, you will need to install the respective app from the Google Play Store. You can check which devices support ARCore here. However, the model Xiaomi MI A1 does not appear in the support devices, so your phone may not support the AR+ feature.