Face ID not working?

obisquare wrote: "The battery life is 100%"

I don't know what you mean by "battery life" — I asked about "Maximum Capacity %".

...To be clearer, this icon is the Settings app:

...Tap it to open Settings app. Then scroll down to Battery and tap it. Then tap Battery Health & Charging and tell us what the Maximum Capacity % is. If its value is only "––", let us know that.

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obisquare ~ One possible cause is a weak, aging battery. So...

Does your iPhone Xs Max still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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