Can't sign in my iCloud id

This support article has a list of things to do if your iPhone, iPad, or iPod touch is lost or stolen. --> If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support There is a case for NOT doing step #7 where you remove the device from your account. Removing it would disable Activation Lock and make the device usable to a thief or a finder. As long as you set Lost Mode and/or erase the device, it will be not be recognized as a trusted device. This information is recommended by Apple in this thread I lost my iPhone - Apple Community

- The Find My service described in the article is the only recovery feature Apple offers. It must be set up before the device is lost.