John564479 At this point in time I basically look at Microsoft as malware
Microsoft Authenticator might collect your IP address, your interactions within the app, and communicate with other Microsoft apps you have installed in that profile, but it's certainly not malware and isn't going to be infecting your device. If you don't want to use the app, there are possible solutions to this, but you might want to consider to simply install the app in a separate profile to avoid app communication with other Microsoft apps in other profiles, then run an always-on VPN in that profile.
Also, if your organization has not disabled the option, it is possible to use Microsoft Authenticator without a network connection (after the initial setup) by using the OTP code that the app generates: when you are asked to approve the push notification, simply select "I can't use Microsoft Authenticator right now" and you'll get the option to input the code instead.
I'll write more about alternative options later, out of time now.