how do i get into my icloud account when i dont know the password
How do i get into my icloud account when i dont remember the password
iPhone 12 Pro Max, iOS 15
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Use a link https://iforgot.apple.com/appleid#!§ion=appleid
You need credentials for secondary authentication account to reset the password ( for that a web browser is required ) , at present you Apple ID is not signed in iPhone , after resetting the password follow the article Sign in with your Apple ID - Apple Support
For 2FA account see the article How to use account recovery when you can’t reset your Apple ID password - Apple Support