Signing out of device

If you can, ask Apple not to delete it until you have unlocked the device. If it too late, request a reset.

From: How to delete your Apple ID account - Apple Support

"What happens if I change my mind after I have requested that my account be deleted?

While your request is being processed, you can contact Apple Support [call them at a telephone number for your country --> Contact Apple for support and service - Apple Support ] with the unique alphanumeric access code you received, and we’ll help you cancel your request. After your account is deleted, Apple can't cancel the request, reopen your account, or restore your data."

Apple can reset a device if a person can provide sufficient evidence of valid ownership (usually the original receipt from Apple or an authorized retailer —> Keep your receipt after you buy an Apple device - Apple Support ). Try this online here --> https://al-support.apple.com/#/additional-support (Yes, apparently this does work in this situation too: How to remove previously deleted apple id… - Apple Community )

You’ll need to submit proof of ownership to request Apple remove it from their end. To do this. Use the start support request link at How to remove Activation Lock - Apple Support