totpprov: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/totpprov - from package: python-totpcgi

You may install the required package with command yum install {package}

Error in other languages:
totpprov: bevel nie gevind nie
totpprov: comandă negăsită
totpprov: comando não encontrado
totpprov: commande introuvable
totpprov: command not found
totpprov: käsku ei ole
totpprov: không tìm thấy lệnh
totpprov: komanda nerasta
totpprov: Kommando nicht gefunden.
totpprov: kommandot finns inte
totpprov: komut yok
totpprov: nie znaleziono polecenia
totpprov: níor aimsíodh an t-ordú
totpprov: no se encontró la orden
totpprov: no s'ha trobat l'ordre
totpprov: opdracht niet gevonden
totpprov: parancs nem található
totpprov: perintah tidak ditemukan
totpprov: príkaz nenájdený
totpprov: příkaz nenalezen
totpprov: команда не найдена
totpprov: командата не е открита
totpprov: 命令找不到
totpprov: コマンドが見つかりません