Apple ID login into Apple Account via browser works, but the exact same Apple ID does not work in App Store, iCloud iTunes !

thank you very much WheelieNick !

i try to understand your answer, but wonder what do you mean exactly with saying "you can get a verification code from settings on one of your trusted devices."? what is my trusted device? and which settings? settings of the phone?

I receive a 6-digit code via sms when logging into the web-based apple account. but the App Store (in Yosemite) does not request a 2nd factor code.

so how to do it precisely? What do you mean with "Login with that instead of your password"?

sorry for not understanding (I am not so firm with these technologies)...

to explain my intention: i am booting from the external yosemite SSD, because i want to upgrade on that SSD from yosemite to mojave. however, if I can't login into App Store via Yosemite, would there be another way to download mojave booting in catalina (which is on the internal drive of my macbook 15) WITHOUT replacing/overwriting the catalina system? eg., can i download a mojave installer, possibly as an .dmg file from somewhere in order to install it on an empty drive or updating from yosemite to mojave on that external SSD ?

important is, that I do not want to downgrade the macbook internal catalina, i want to keep it. my intention is to install mojave on the external ssd (which currently has yosemite).

best wishes, thomas

thanks Niel, I wil try that tomorrow ! the only thing is, that the App Store does not send me a sms code request. so, do you mean i should parallely login via browser (which still works on yosemite) and then should use the browser-based sent 6-digit code immediately (within time limit) in the way you describe when login into App Store?

good night. t

hi Niel, i quickly tried in App Store and in iCloud (in Syst. Pref) and that way it does not work... ("abc123456")

:(

Is there a way to download/install Mojave via browser (instead via App Store)?