If you deactivate a member’s account, you have the ability to reactivate it. Reactivating a user's account allows them back into the platform and any Group they were still an active member in.
To reactivate a Member from your Organization, follow these steps:
Select the Organization Administration icon from the top of the page. Select Membership from the panel on the left hand side of the page.
Next to Showing, select the gray Inactive button.
Under Actions, select the Reactivate button associated to the Member you would like to reactivate from your Organization.
The Member is now reactivated.