Unable to login to Admin Account

Hi John, 

Welcome to the Box community!

Below are the steps on how to add managed users to the enterprise:

1. Go to Admin Console > Users and Groups.
2. Click the Managed Users tab.
3. Click Add Users () and then click Add Users Manually.
4. Enter the managed user's name and email address. 
5. Optionally select Groups for the user to be a member of and Folders for the user to have access to.
6. Optionally hover over a user row and click the gear icon () to configure other user settings for that new user or click  and then click Select User Settings for All Rows to configure other user settings for all new users. See the Managed Users Tab section of Users & Groups Settings for details.
7. Optionally click Add User to add a row to the table. Then repeat steps 4 through 6 for each user.
8. Click Save.

Reference article: https://support.box.com/hc/en-us/articles/360043691614-Adding-Managed-Users

Note: If you get "1 user failed to be added" Message When Adding Managed User, ignore the error message and press the Save button again. Saving a second time will begin the invitation process.

Thank you for posting!