Would you install an application on your cellphone for work?

[Ferrocyanide]

I didn't have to install the apps, but I did. One shows my schedule and the other is a payroll app.

I think that is ok if you want to view your schedule and payroll, however, even in that case, I would not install any apps.
It should be a website from where you can download a document or they should give it to you on paper.

Don't worry about cutting trees. They use tree farms.
In my case, I burn a lot of stuff in my fireplace. It is the best way to recycle and it also heats up my house.

---

Maybe I'm naive, but Microsoft Authenticator doesn't seem very invasive to me, so I'm ok with having it for work on my personal phone. Not that I have much choice here anyway.

I don't know what it does since I don't have the source code.
One issue is that Google and a few companies are trying to push this on users.
If you have a personal email, then you are probably not part of the military, you aren't working with top secret info and so, you don't need that level of security.

The other problem is that you become traceable. You can no longer create a throw away account.
Google seems to want to tie your account to your cellphone number.

Overall, there is a matter of principle. If Microsoft Authenticator is part of the companies security choice, then they should provide the equipement, the same way they provide a chair, a laptop, a desk, electricity.