why is my face ID disabled

This document is specific to seeing a 'disabled' Face ID alert, and explains what to do when you see that notice. --> If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support

This is generally a hardware issue. If the unit's on an OS version older than 16.5.1, you might be able to fix it by updating it from a computer or the Software Update function in Settings; otherwise, contact Apple Support.

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kayelanie ~ Does your iPhone 11 Pro Max still have its original battery?

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

Settings > Battery > Battery Health

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