Massive Necromancy, yes, but I’m experiencing a similar issue and since the search took me here it may be relevant to update the commands based on this experience.
My situation is as follows:
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Some of my users tried to change their main e-mail.
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They claim it didn’t work. That they received an e-mail to confirm but when clicking on the link it always gives an “Expired/Doesn’t Work” message.
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I go as an Admin to change said e-mail, do it by editing their profile.
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Now the main e-mail is “waiting confirmation/verification”.
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The users don’t receive any confirmation e-mail.
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No matter how many times I press the “resend validation/confirmation e-mail” option on their profile, it doesn’t send (checked on the Admin/E-mail section, no outgoing e-mail for that. Ironically if I click to send them the “reset password e-mail” that one does send).
Thing is, if any of those users cleans cookies/etc they won’t be able to access their account again (actually happening right now). So I tried this:
But I’m getting NoMethodError: undefined method `update' for nil:NilClass. So maybe the fields changed again in the last two years? 
Any help is welcome.
PD: Also, if I try to change the e-mail to something else or to the old one, now I (admin) get the message “You did this action too many times. Please try again later”. How much time is later and why is the Admin rate limited on changing e-mails if I only did it once? I probably did something wrong and didn’t realized it 