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Apple - Support - System Status
Read this article to learn how to remove Activation Lock either on the device itself or on the web --> How to remove Activation Lock - Apple Support
Basically it is going to need the account information in order to remove the lock. Are you sure you are using the correct information?
● Help with a lost Apple ID or password:
• For help with a forgotten Apple ID (this is likely an active email address or one used in the past), click here --> If you forgot your Apple ID email address or phone number - Apple Support
• For help with a forgotten Apple ID password, click here --> If you forgot your Apple ID password - Apple Support
If you are having problems with an inactive account, contact Apple for help with Apple ID account security --> Contact Apple for help with Apple ID account security - Apple Support