Any users that were disabled can be reactivated.

You can activate a user by searching for disabled users in the User panel search box.

To search for deactivated users:

1. Click the search icon (magnifying glass) at the top right corner of Users panel:

2. Switch status to Non-active users and click the Search button:

3. Click on the user icon and choose 'Activate':

If you want learn how to disable a user click here. 

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