What if I don’t remember the number that I used to setup the two factor authentication
How can I get access to my account if I don’t remember the phone number used to setup the two factor authentication
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If you have a trusted device or computer, you can log in to https://appleid.apple.com with your email and password and see it there in the security section and change it or add a new one if required.
Details here: link-> Two-factor authentication for Apple ID - Manage Trusted phone numbers - Apple Support