How to Add a user into a group
Login-to Domain Controller and open the Server Manager click on Tools and then Active Directory users and computers:

Navigate to the G*roup** and double click on that to open properties:
Click on Members and then Add button:
Enter the Name and then click OK it will add the user to the group it will take up to 30 Minutes to update it into Offics365:

Navigate to the G*roup** and double click on that to open properties:
Click on Members and then Add button:
Enter the Name and then click OK it will add the user to the group it will take up to 30 Minutes to update it into Offics365:
Updated on: 31/01/2023
Thank you!