It doesn't look like the problem is going away no matter how many people report it or complain so, I would like to remind everyone that you should only download the Steam Desktop Authenticator from Jessecar's Github here: If you have any doubt as to whether or not the fake Steam Desktop Authenticator I'm talking about is, in fact, malicious,.
I refuse to install another authenticator app on my phone this is ridiculous.
This project is run by community volunteers.
Finally I found the answer with your help.
The only available 2-factor authentication available for Steam unless you count email, which doesn't allow you to trade or play competitively so far is their mobile app.
We want to help make the process as simple as possible from start to finish.
Description: This error message could also occur if your current certificate is not installed on the domain.