Q: help icloud account activation lock

You likely may have to take the iPhone to an Apple Store for help.

See about using the online support page to set an Appointment.

An official Apple Store usually has Genius on staff. A path to setup

appointment starts here:

• Make an appointment at an Apple Retail Store Genius Bar
• Find an Apple Authorized Service Provider

An authorized retail Apple service center may also be able to help.

These usually are independent from official Apple Store.

Were you following the path set forth here to prepare the older iPhone?

• What to do before selling or giving away your iPhone, iPad, or iPod touch - Apple Support

Other topics that you may or may not have seen, have some information:

• Find My iPhone Activation Lock - Apple Support

• iCloud Support - Find my iPhone, iPad, etc (details w/ links) - Apple Support:

https://www.apple.com/support/icloud/find-my-iphone-ipad-ipod-mac/

Any number of small details may have set you on an incorrect path in this matter.

Good luck in any event...!

Take the original proof of purchase with you.