1. If you haven’t done so already, create the Azure AD authentication service account.
2. Make sure that you have enough licenses for community users.
3. From Setup, in the Quick Find box, enter All Communities, and then select Workspaces under Action.
4. From the community workspaces menu, select Administration and then select Login & Registration.
5. Under Login, select the option to display the Azure AD authentication provider, and save the settings.
6. Log out, and go to the community login page.
7. Choose the Azure AD authentication service, and log in with your Azure ADcredentials.