I do not mind as much using my own mobile if it is a TOTP standard that I do not need to install spyware for. I have already TOTP apps that I can add QR and it's not costly or difficult.

Any kind of third party internet required app? Do I required Microsoft Authenticator or Duo - always on push access, internet required, logs my phone's IP and location? They must pay for the device and the plan. If you want me enter MDM, Outlook, ActiveSync? They must pay for the device and the plan.