Cannot get into iTunes and app store on my mac after new hard drive instillation

i had a new hard drive put into my mac recently, and since then i have not been able to access the app store or iTunes on my mac, which will also not allow me to sync my phone to it anymore as it is now not authorized to do such. I have contacted apple support, reinstalled the OS, and have enabled 2 step verification to verify my mac as a device, yet still will not work, is there any other way to fix this?