How do I lock my Apple Account from my stolen/lost iPhone?

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Also, to lock your iPhone remotely you can do that via find my

1. Go to the Find My app on your iPhone.
2. Tap Devices at the bottom of the screen, then tap the name of the device you want to erase.
3. Tap Erase This Device, then tap Continue.

Erase a device in Find My on iPhone – Apple Support (UK)

Read this support article about what to do if a iPhone or iPad is lost or stolen -->

Find your lost iPhone or iPad - Apple Support

- 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.

- Note that if you remotely erase your device as instructed in this article, if you subsequently remove it from your account as in this article --> Check your Apple Account device list to find where you’re signed in - Apple Support , then according to this article --> How to remove Activation Lock - Apple Support you remove activation lock from the device. Do not remove it from your account. If you do then a finder or thief will have an unlocked device that can be used by another person.