How to get a Linux VM to pass MSAL SSO authentication?

I have a React app that uses the [Microsoft Authentication Library](https://learn.microsoft.com/en-us/entra/identity-platform/msal-overview) (MSAL) to identify users. It works just fine on my Windows machine; however, for a variety of reasons, I'm trying to get a Linux VM set up to do certain development tasks. Unfortunately, its user isn't a "real" Active Directory user, so the app just hangs when I get to that step. In Windows, I can simply right-click on an application and impersonate another user to run it. However, I haven't been able to figure out a good way to do that in Linux (especially given that it must be an Active Directory user). (In this case, I would like to do something similar with the web browser). Does anyone know how I can do that? I am using an Ubuntu machine if that makes any difference.