Passwords
Why is Apple not saving or suggesting new passwords
iPhone X, iOS 14
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On your iPhone, iPad, or iPod touch, tap Settings > [your name] > iCloud > Keychain> Advanced and tap Change Security Code. On your Mac, choose Apple menu > System Preferences, click Apple ID, then click iCloud in the sidebar. Select Keychain. ... Choose "Change Security Code..."
If iCloud Keychain won't turn on or sync - Apple Support