I was checking the new version of Proxmox, when I noticed there is an option to enable 2FA; (see the docs) It works really fine, but then I realized my colleague’s probably don’t have the key. To disable however, I couldn’t find it online; So I digged in the guts of Proxmox /etc/pve/user.cfg there is a line similar to :

user:[email protected]:1:0:::[email protected]::x!oath:

I changed this to :

user:[email protected]:1:0:::[email protected]:::

That change let me log in without the 2FA.