device was erased from icloud and i didn't erase it

See the article Use Lost Mode in Find Devices on iCloud.com - Apple Support

Turn off Lost Mode on an iPhone, iPad, iPod touch or Apple Watch

1. In Find Devices on iCloud.com, click All Devices, then select the device that is in Lost Mode.
2. Click Lost Mode, click Stop Lost Mode, then click Stop Lost Mode again.
3. You can also turn off Lost Mode by entering your passcode on the device.

Note: If you had any cards suspended when you put your device in Lost Mode (credit or debit cards for Apple Pay, or student ID cards or Express Travel cards), when you turn off Lost Mode and sign back in to iCloud, you can use them again.

Em345 Said:

"device was erased from icloud and i didn't erase it: Hi! i lost my iphone a month ago, and now i'm getting a notification that my device is being erased from the cloud, i checked in icloud.com/find and it appeared as erased[...]"

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Troubleshooting "Erase iPhone" Message:

A. Provide a Screenshot:

Take a screenshot on your iPhone - Apple Support. IMPORTANT: Block out personal info, by covering it with with red rectangles and such.

B. Perhaps this is a Scam Message?:

So, what to do...

A. Force Restart your iPhone:

To safely get out of this, Force Restart your iPhone. Go here: Force Restart iPhone - Apple Support

and...

B. Report this to Apple:

So, report this messages info to Apple, and your federal government, if an option. Provide the screenshot and the URL of this thread. Use my User: Using the Photos App to Report Scams - User Tip

What kind of notification? A text message? Ignore it. That’s likely someone trying to get your credentials.