Unable to sign into App Store from my Macbook Pro (Retina, 13-inch, Early 2015)
I am setting up my old Macbook Pro (Retina, 13-inch, Early 2015) as school computer for my daughter. I erased everything and installed OS new. During set up it didn't let me sign in with mine or her credentials. I had to sign in after everything was installed. However, when I try to update the system from OS X Yosemite to any later OS, like Monterey, it asks me to sign in to download from the App Store. I enter my credentials and it claims that "Your Apple ID or password is incorrect." They are not. I get the notification with the code to enter on my other devices, but I have nowhere to enter it on my MacBook. I only get the message that my credentials are incorrect. What am I doing wrong? PLEASE HELP!
MacBook Pro 13″, OS X 10.10