udval224 Said:
"My lost iPhone not showing up on Find My Device: I changed my password and now my lost phone is not showing in find my phone. is this means that the person who found my phone can use my phone now? What should i do?"
-------
Troubleshooting a Stolen Device:
Changing your password is an excellent step to take. If your password has been changed, then they will not able to get into your Apple ID. If there is a passcode on it, then it will be locked, if too many unsuccessful login attempts.
Modify your Credentials:
Consider modifying your credentials, for Security & Privacy concerns, starting with a new eMail address. Here is how it would work with Apple: