@feditips
I use the Microsoft Authenticator app.

My workplace uses Microsoft 365 and Azure AD with 2-factor for our authentication, so I already use Microsoft Authenticator for 3 accounts (2 for work and a personal Microsoft account), and it's nice to have all the rest of my accounts in the same place.

It also functions as a password manager that syncs with Microsoft Edge, so all my passwords set in my browser are auto-filled on that service's mobile app.