@Pavel yannara Mirochnitchenko, Thanks for posting in Q&A. In fact, the Microsoft Authenticator will be installed automatically when you do Android Enterprise Fully Managed, Android Enterprise corporate owned with work profile or Android Enterprise Dedicated enrollment. This is by design. And can't be removed during enrollment. Here is a link list more detail for your reference:
https://learn.microsoft.com/en-us/mem/intune/apps/apps-add-android-for-work
Thanks for your understanding.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.