Why does Facebook tell me I haven’t logged onto it from my computer before, when I have?

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Hi,

I cannot enter my account on Facebook: I get this message:

Enter Security Code to Continue

It looks like you haven’t logged in from this browser before. Please enter the security code from your phone below.

…

The computer and internet account where I try to access the account is the same oen I used since I created the account in 2013. I do not remember having linked any mobile phone to this account, I also do not have a smart phone able to connect to the internet. I already changed my password through the Google account twice but I always get to this message.

Could you please explain me what is happening? What do I need to do to keep using this account?

Post and answer: Why does Facebook tell me I haven’t logged onto it from my computer before, when I have?