I can’t authenticate to remote host with password using 2FA

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I have a Ubuntu 20.04 VM running as a jump box for the rest of my servers. I have connected it with a DDNS service to access it remotely. If I use ssh keys I can log in to the server normally, but if I use password authentication with 2FA (Google’s pam 2fa module) I get “Authentication failed”,
What can I do in order to fix that problem?
I have tried from different computers and OSes but the problem is from the machine itself. Google doesn’t seem to help.
Thanks in advance.

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