I have access to Visual Studio Team Services (www.mydomain.visualstudio.com) and initially I use only the Microsoft Authenticator , that is, Microsoft two-step verification .
Would you have any other alternative to ensure more security and hinder access to the VSTS account?
You have already taken all possible steps to inhibit access to your user . When security to your account, this is guaranteed by Microsoft itself, given that Microsoft invests heavily in security on its cloud platform, where it has several security certifications .
You may rest easy, as a security breach in your VSTS account is very unlikely, I could say that it is much safer for you to keep your data in VSTS than in an OnPremisses environment with TFS, where company may have a greater number of holes in the network and not know it.
