"Unable to verify this iPhone has a genuine Apple battery"

mony ~ Verify if your provider has access to Apple genuine parts and repair resources:

Repair Provider Verification - Official Apple Support

About genuine iPhone batteries

...Found by searching Apple's Knowledge Base.

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Have you recently had your iPhone's battery replaced at an Apple Store? If so, you should return and show them the message in Settings.

You can find out more information about the message by tapping 'Learn More' underneath it.