@Raj Joshi. Thanks for the reply. Based on my researching, we can manage users and their mobile devices using both Intune and Basic Mobility and Security in the same Microsoft 365 Business Standard organization by setting up Basic Mobility and Security first, and then adding Microsoft Intune. This allows you to choose Basic Mobility and Security or the more feature-rich Intune solution.
If you have enabled Microsoft Intune first then set up Basic Mobility and Security, Basic Mobility and Security, may not work. Please open case to see if it can be changed to let it work.
https://learn.microsoft.com/en-us/mem/get-support
Have a nice day!
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.