Macbook wont let me enter Apple ID

Ok, the issue is your MacBook's operating system is too old to work directly with 2FA. It would need to be upgraded to, at least, OS X El Capitan.

If you try to sign in to your iCloud account using an older device that isn’t running at least iOS 9 or 10.11 El Capitan, or an older Apple TV model, you must get a verification code from a trusted device (or via SMS or phone call), and then, append that to your password when you enter it.

• Ex: If your password is: mypassword, then enter: mypasswordNNNNNN, where NNNNNN is the verification code you received on your trusted device.

Are you getting a 4-digit or 6-digit code on your iPhone to enter into this MacBook Pro? Which exact model is this notebook and which version of OS X or macOS is it running? ... and which version of iOS is your phone running?

Which security type is your Apple ID enabled for: 1) Two-Step Verification (2SV), or 2) Two-Factor Authentication (2FA)?

Ref: Get a verification code and sign in with two-factor authentication - Apple Support