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Uhhhh if someone is asking for a randomly generated authentication code you might want to double check who you’re talking to and make sure you’re not being scammed.
Edit: seems it might be normal? https://forums.xfinity.com/conversations/customer-service/customer-service-asked-for-my-2fa-code-to-verify-my-account-over-the-phone-despite-the-text-saying-not-to-share-with-xfinity-reps-normal/6410d59641879c3c4d1c6128
Holy shit that’s bad practice. Great way to get less tech savvy people used to customer service reps asking for verification codes and trusting them without hesitation.
It’ll break saving books you bought from Amazon, but you’ll still be able to send books you got from other places to it from Calibre. Fortunately barely any of my ebooks on my kindle are from Amazon (though my next ereader isn’t going to be a kindle, that’s for sure).