Activation Lock Problem

Hello everyone!

I recently bought a new iPhone 6 and I linked it to my iCloud account. The problem is that my iPhone 4s decided to update and when I turned it on, it says to me that I have to activate it with my iCloud account. I put my e-mail and my password and then I get the message that this iCloud account can't be used to unlock this iPhone.

On the other hand, I access in my iCloud account through my Mac, I go to Find my iPhone to erase the 4s, as the instructions says, but when I click on "All Devices" tab, there is only the iPhone 6. When I go to Settings, I see both iPhones but can't erase it from there.

Can you help me, please?