My phone has been nowhere to get wet, why is this alarm showing up on my phone?

As the Littles suggested, read all of the linked Related Article, especially the final paragraph:

If your iPhone and Lightning accessory aren't wet

If you see this alert every time you connect a certain cable or accessory, that cable or accessory might be damaged. Contact the manufacturer.

If you see this alert every time you connect an Apple Lightning cable or accessory, contact Apple Support.

I received the moisture warning message when first connecting an iPhone 12 Pro to a Mac mini using a 3-meter Lightning-to-USB-A cable from a third-party supplier. Neither the cable nor the phone has ever been exposed to moisture.

The same cable always works successfully both connecting and sync-ing other older Apple devices (iPad Air 2, iPad Pro 10.5", iPhone SE 2020).

When I reconnected the same iPhone 12 Pro to the same Mac mini with a (1 meter) genuine Apple Lightning-to-USB-A cable, the warning never appeared again.

This appears to a hardware issue related to water/moisture detection. It cannot be solved here. I recommend that you have your iPhone examined at the Apple Store or at an Authorized Service Center for further diagnosis and a resolution.

Axel F.

Ofle13 Said:

"My phone has been nowhere to get wet, why is this alarm showing up on my phone?: Why does the water detect come up on my phone? It has been nowhere near water?"

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Refer to the link provided atop this thread.