I can't enter the verification code in 2015 MacBook Air
Hi! I have recently had my problems with the keyboard on my mac so my Dad has given me his old macbook air from 2015. It is newer than mine. When i try to sign in to my apple ID on his laptop it gets to the point at which it sends my phone a verification code, I type this in and then a loading sign comes up with the continue button blanked out and unable to press. I cannot get past this and I have tried restarting the computer.
Any suggestions? I am in the middle of my dissertation so any help would be really appreciated!!
[Re-Titled by Moderator]