Microsoft Authenticator, installable and works in SFOS 4.5.0.21 / XA III?

Thank you for this information about Cloud Messaging. I was close to bursting a vein when that hellspawn of an app kept claiming that the QR code is already used. Finally got past that bit of the setup.

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I have to revise this statement of mine in the meantime: It worked and still works for me without Play Services for “simpler” applications like 2 factor authentication for certain mail providers.
It doesn’t work for a VPN connection establishment for a specific VPN infrastructure product. The account created for that in MS Authenticator doesn’t work.