Figure 1: We propose the use of VR for in situ authentication evaluations in private and sensitive contexts. We investigated the impact of isolated authentications, where users authenticate in a lab environment (➊), and in situ authentications, where users' authentication precedes a primary task (➋), on a system's usability evaluation results. Our work highlights the importance of in situ authentication evaluations, demonstrates how the use of VR advances common authentication system evaluations, and enables researchers to research contexts that are close to impossible to study in the wild and challenging to replicate in the lab.