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I enabled 2FA, logged out of iCloud on my iPhone, then logged back in. It asked me for the "password" on my Macbook Pro. What? How would Apple have access to a user password on my MBP? I have multiple users on my MBP... what would happen if I were logged into the same iCloud account with two different users?

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Surely it's referring to the temporary pass code which is generated and presented to the relevant user on your Mac?

Out of curiosity, I tried (and then immediately changed) my main user account password, and it successfully authorized my iCloud login on my phone. I am really curious what's going on here. I expected it to ask for a numeric code like you mentioned, but it just gave me a plain UITextField to enter the password for $my_macbooks_hostname

I do not have keychain syncing enabled in iCloud, just contacts/calendars.

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