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google-authenticator is installed on the server, here is how you activate the 2-factor authentication for each account:
Log in to your account with SSH;
Create a new secret key,
$ google-authenticator -tDfuw 3
$ google-authenticator -cfuw 3
The script will then send back to you:
For TOTP verifications, you will need to indicate the code sent by your software.
The installation is complete, the SSH 2-factor authentication is now activated.