The only windows thing that goes through my phone is Outlook and I intend to keep it that way, I also have a minimum of apps and thode I do have only get the permissions that are absolutely necessary.
What permissions does the authentification app want on your phone as a matter of interest?
If this is forced on us, it will be yet another reason to jump ship, why should I need to fire up one device in order to fire up another?
Doesn't sound much like progress to me.