If you can log in, you should be able to log in from all computers. Maybe you have stricter cookie settings or something on your laptop? I turned off uBlock Origin for some reason on lemmy, I don't remember the bug that it was causing, but there was one.
Same for me, when I crated an account in lemmy.one, the notification was shown "error sending email" or similar. Now the account @CaptainBlagbird@lemmy.one was apparently created, but no verification mail was sent out. Because of that (?) I can't log in there.