If you have two factor authentication, we need you to use "app-based" two factor to login so that we can login to your account.
We do not support SMS based two factor authentication at this time, as we do not have access (obviously) to receive the code each time we login.
The reason we don't support SMS based two factor login is because of how we work: because we use our pool of devices to post customers' posts, we aren't able to leave you "logged in" to one of the devices at all times.
You can set up app-based two factor authentication so that your team can all generate two factor tokens rather than SMS based tokens. You can read how to set this up and make it connect with Sked here.