Apple ID issues BigSur11.3.1
Since the update my Keychain does not sync and issues with login!
MacBook Pro 15″, macOS 11.3
Question marked as
Do you have 2 Factor Authentication enabled on your Apple ID? Current services from Apple that require 2FA include:
Apple Card
Apple Pay
Home Kit
Messages in iCloud
iCloud Keychain (in newer IOS/OS versions).
See if anything here helps.
Frequently asked questions about iCloud Keychain - Apple Support.
Everything you need to know about iCloud Keychain - iMore.
The below is an older article and some things have changed slightly.
An essential Mac OS X Keychain guide - Computerworld
For the login problems, where are you trying to log in? What happens when you try? Error message(s)?
Tried logging out of your user account and back in?
Are you running any anti - virus programs? Using a VPN?
Try setting up another admin user account in System Preferences/Users & Groups to see if the same problem continues. Also try the Safe Mode.
Isolating an issue by using another user account
If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown. If the log won’t post, try posting it in Pastebin and provide a link in a reply. After pasting the report in a PasteBin page, go to the top of the page, and copy the address in the URL bar. Paste that in a new reply. Pastebin.