I'm not sure if folks at Microsoft are aware, but the community has been unable to profide feedback for the Microsoft Authenticator Testflight application due to underliverable mail at the feedback address listed in Testflight: mailto:email address removed for privacy reasons.
Due to this, there is a thread with over five pages of community feedback mostly stating that it is impossible to use any of Microsoft's applications for Vision Pro when working at companies that require device registration with Microsoft Authenticator, since Microsoft Authenticator cannot be installed on Vision Pro.
https://answers.microsoft.com/en-us/msoffice/forum/all/authenticator-app-on-apple-vision-pro/68aa4129-f3f0-418d-8f03-b1724198d421?page=5&messageId=29170589-caa3-4924-ac90-cda28793845c