SSO between native mobile apps

I just ran into an issue I haven't reflected over before, since the need hasn't arisen.

Is SSO enabled out of the box between native (in this case Android) mobile apps? I'd like a user to be able to sign in to one OS app, and then be automatically signed in when they open another. I can't get this to work, which I find surprising; I took for granted that SSO should be enabled between native apps as they are in reactive, PWA and traditional.

Note that I'm talking about built-in OS login through the Users module; I'm not using any of the IdP components here.

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