When I enter my Apple ID to sign into the App Store I get this error message - The data couldn’t be read because it isn’t in the correct format.
I'm using a MacBook Pro running MacOS Sierra. I cannot update to the latest MacOS because my computer is too old.
Does anyone have a solution?
MacBook Pro 17″, macOS 10.12
Hi! I had the same issue with my 2013 MacBook Air that has macOS Sierra 10.12.6 and was able to fix it! You have to go to the Apple Logo Icon on the top left of your computer and sign-in your Apple ID by connecting to your iCloud account through your Internet Accounts. Here is the pathway:
> System Preferences > Internet Accounts > iCloud.
Make sure "Access iCloud Data on The Web" is turned on through your iPhone or iPad at the bottom of the iCloud settings page.
pathway: Settings > Apple Account > iCloud > "Access iCloud Data on The Web" -> On.
I hope this helps!
Hi! I had the same issue with my 2013 MacBook Air that has macOS Sierra 10.12.6 and was able to fix it! You have to go to the Apple Logo Icon on the top left of your computer and sign-in your Apple ID by connecting to your iCloud account through your Internet Accounts. Here is the pathway:
> System Preferences > Internet Accounts > iCloud.
Make sure "Access iCloud Data on The Web" is turned on through your iPhone or iPad at the bottom of the iCloud settings page.
pathway: Settings > Apple Account > iCloud > "Access iCloud Data on The Web" -> On.
I hope this helps!
In of the past 6-10 hours, affected macOS systems—including Sierra and High Sierra—can sign in to the App Store again, Apple has switched on access again. I’ve personally tested this, and it’s working
Do not consider this permanent though. Use this opportunity to:
Open and use your legacy apps.
Export or back up anything critical you deem irreplaceable or cannot afford to lose.
This situation serves as a reminder: There are no guarantees of permanent access to legacy apps. Be proactive in seeking trusted alternatives or backup copies where possible to avoid being locked out in the future.
Spoke to Apple Support on this issue and the response is to the effect of 'your system is too old and unsupported anymore'.
Just tried this without success.
A helpful developer has pointed out this - TN3138: Handling App Store receipt signing certificate changes | Apple Developer Documentation
Unable to sign into App Store
