Deactivated Apple ID can’t sin out my iPhone

You will either need to get the old account working again or you will have to hope you kept your receipt from Apple when you purchased the iPhone from them.

Apple has two related features, Activation Lock ( Activation Lock for iPhone and iPad - Apple Support ) and Find My ( iCloud+ - Find My - Apple ), which are designed to prevent anyone else from using an iPhone, iPad, or iPod touch if it's ever lost or stolen. Deactivation ( How to remove Activation Lock - Apple Support ) of either requires knowing the Apple ID and password that set the feature, or by placing a special request to Apple to reset the device. This Apple ID information essentially defines the current ownership of the device. If you do not know the required information, or do not have an Apple accepted proof of purchase, the device is otherwise useless to you.

Here are additional resources to recover account information or there is an Apple accepted proof or purchase

● You could try to get it working again, as outlined in: How to delete your Apple 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 might reset a device if you can prove to Apple's satisfaction you are the owner. However, Apple will not do so if Lost Mode is set on a device which may have been done by a scammer if a person signed into their device with scammer’s account.

Apple can completely reset a device if a person can provide sufficient evidence of valid ownership. This is done online* at: Activation Lock support request - https://al-support.apple.com/#/additional-support Apple says, "Proof of ownership documentation is required," but does not provide many details in the article as to what is acceptable proof. Prior to this official service Apple typically required the original receipt** issued by Apple or an Apple Authorized Reseller. Note that while this will let you get use of the device again, it will not help you with lost access to an account.

* There is a special link for this service. To save time you should use it instead of https://getsupport.apple.com/

**Apple recommends you keep your receipt after you buy an Apple device. --> Keep your receipt after you buy an Apple device - Apple Support