@Santhosh B S, Thanks for posting in Q&A. For your tenant, please ensure you have purchase Intune subscription. Here is a trial one.
https://learn.microsoft.com/en-us/mem/intune/fundamentals/free-trial-sign-up
Please also ensure there's Microsoft Intune license in your environment.
After that, check if the MDM Authority is Microsoft Intune. If still not, you can go to 'Troubleshooting + Support' --> 'Guided scenarios' option from the Intune admin center. When you choose the 'Set up a test device to try out cloud management' option, the MDM Auth selection window automatically appears and allows Intune to be selected.
Hope the above information can help.
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.