
Thank you for posting this in Microsoft Q&A.
You do not have to switch over anything. Earlier, there was a option to assign licenses either through Azure AD portal (Entra ID) or Office 365 admin center.
The announcement indicates that starting September 1st, for license assignment you will have to access the Microsoft 365 Admin Center.
You can refer below article to learn more about assigning and unassigning licenses through Microsoft 365 Admin Center,
Let us know if you have any further questions regarding this.
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