@Alexey Dmitriev that option doesn't exist on Android's Authenticator app. There's no such thing as an "Accounts" section in Settings. And before you ask, my app is up to date.
My headers are: Notifications, Backup, Security, Work or school account, Stay logged in to your Microsoft work or school account, Logs, Autofill settings, Verified IDs.
There is no option for Account Management of any sort of under settings.
One would think you'd be able to interact with the greyed-out items, but this is not the case.
I work for an MSP. I have several management identities in my Microsoft Authenticator app that I want to remove. ACTIVE accounts can be removed just fine, but these greyed-out accounts cannot.