There isn't much here beyond speculation. No technical analysis, certainly.

GrapheneOS is neither rooted nor jailbroken in any technical sense, and Authenticator certainly works today, as do Work Profiles and Intune Company Portal (with a little wrangling). Would be nice to know if this is real or not since I am forced to rely on the app even though I don't want to.

I only use authenticator with an old phone next to my work computer. No sim card, minimal apps. Don't do work apps on my main phone, especially InTune.