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A wafrn woot (post) by @tinker@infosec.exchange saying "Microsoft Authenticator needs me to validate with Authenticator in order to log in with Authenticator to use it to authenticate another app with Authenticator. Here is the app telling me to open itself to validate itself with itself. #infosec #iHateComputers" It has a screenshot showing the microsoft authenticator app.
Why not just install the Authenticator APK some other way initially? Just give people a download from some random server you control.
I tried that and the app started bitching about not being installed from the google play store
Ah well, last time I tried, my banking didn't like being installed from Aurora Store either. :/ Haven't tried it but there is an APK available from APKPure which is at least not a super-dodgy location: https://apkpure.com/microsoft-authenticator/com.azure.authenticator