This is a bit vague. Is this applicable to strictly Amazon accounts with devices e.g. Echos? All Amazon accounts whatsoever, including those only used for shopping and never connected with any "smart" devices like Echos or vacuum cleaners? Does this apply to AWS? I understand you can't divulge any specific details, but it would be helpful to know what you're suggesting is impacted to know what to preventatively lock down and redo 2FA.