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I have a MacBook Pro (13-inch, 2016, Two Thunderbolt 3 ports) and I found the MacBook has been very slow after upgrading to Big Sur. Many people suggested downgrading to High Sierra and I reinstalled High Sierra. The machine is much faster, however, I cannot log in to the iCloud (as shown below), the App Store and even cannot install XCode.

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I tried many methods, however, currently, there is no workaround to address this issue.

GoingMyWay
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  • Can you log in to icloud.com or with the same account on a different device (to eliminate an access issue with the account)? – fsb Oct 19 '21 at 16:02
  • @fsb Yes, I can. – GoingMyWay Oct 19 '21 at 16:05
  • Do you have two-factor authentication turned on for your iCloud ID? – fsb Oct 19 '21 at 16:38
  • @fsb Yes. I turned it on on my iPhone: https://support.apple.com/en-us/HT204915. On my current MacBook, I cannot turn it on as I should log in to the iCloud. I have MacBook Pro M1, maybe I can turn it on on that machine. – GoingMyWay Oct 19 '21 at 16:47
  • I'd guess you'll need to update to Mojave at least to regain the functionality. There are a great many bugs [that will never be fixed] in HS & earlier, resulting in inability to correctly work with the App Store. You can get Mojave direct - see https://apple.stackexchange.com/questions/309399/how-can-i-download-an-older-version-of-os-x-macos – Tetsujin Oct 19 '21 at 17:36
  • This might have something to do with 2FA. Are you receiving the 2FA code on your other devices? – fsb Oct 19 '21 at 19:08
  • @fsb Yes. I received. – GoingMyWay Oct 20 '21 at 00:14
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    @Tetsujin I think maybe that is the reason. – GoingMyWay Oct 20 '21 at 09:23
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    @Tetsujin, I installed Mojave and there is no issue now. – GoingMyWay Oct 20 '21 at 23:45

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