So my company decided to migrate office suite and email etc to Microsoft365. Whatever. But for 2FA login they decided to disable the option to choose “any authenticator” and force Microsoft Authenticator on the (private) phones of both employees and volunteers. Is there any valid reason why they would do this, like it’s demonstrably safer? Or is this a battle I can pick to shield myself a little from MS?
There’s no “battle” here. It’s their phone, end of discussion. They don’t need to justify to you or anyone what they do and do not want on it.
What you don’t understand is that a worker does not need your permission or approval to exercise their right to control their personal property, and that right far exceeds any concerns about how easy the IT admin’s job is.