My Apple ID is locked why
Why is my Apple ID locked and how can I unlock it
iPhone 11, iOS 15
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Apple locks accounts for several reasons. In most cases, there are concerns about your account safety and security. You will get one of the following messages:
“This Apple ID is disabled for security reasons”
“You can’t sign in because your account was disabled for security reasons”
“This Apple ID has been locked for security reasons”
While this all sounds very serious, a simple Apple ID password reset most of the time solves this issue. Make sure to change your password once In a while and turn 2 factor authentication on if you haven’t done that already to make and keep your Apple ID as safe as possible.
See this links for further reference
What to do if your Apple ID is Locked or … - Apple Community
If your Apple ID is locked or disabled - Apple Support