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on switching the account (su - <new-user>) or escalate privileges (sudo <command>) it does aks for key

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This is a great article. Crisp and clear. Thank you so much But I had this question on how this can be done that the verification code is asked again when sudo <command-name> is done or account is switched using su - <username>

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Hello, @mail2mohitjoshi

You can try adding the following code to the /etc/pam.d/su file and then restart the ssh daemon.

  1. auth required pam_google_authenticator.so

Hope that this helps! Regards, Alex