I cannot access my Appleid on my old MacBook Pro!
On my new MacBook Pro (2020 Intel) I have no problem and my old MacBook (mid 2009) is also registered under devices .
When accessing my Appleid on my old MacBook, the system is accepting my id and password, and after entering the numbers for the two-factor identification I receive just a white page back.
When accessing iCloud on my old MacBook, the system is asking my password over and over again. No message for wrong password. On my iPhone I receive a message for entering the two-factor numbers, but the system is asking only for my password.
Note that I did upgrade the old MacBook Pro to OSX 10.10.5 Yosemite just before I noticed this issue.
Could somebody help me?
Thank you very much
MacBook Pro 13″, OS X 10.10