Message: Access denied - insufficient permission for client.users(user_type='all')

I am using JWTAuth. I am authenticating just fine as I can successfully run 

client = Client(config)
groups = client.get_groups()
for group in groups:
    print('Group "{0}" has ID "{1}"'.format(group.name, group.id))

However When I try to get user info I get 

boxsdk.exception.BoxAPIException: Message: Access denied - insufficient permission
Status: 403
Code: access_denied_insufficient_permissions

I am copying code directly from the sdk docs

users = client.users(user_type='all')
for user in users:
    print('{0} (User ID: {1})'.format(user.name, user.id))

I have tried changing user_type to 'managed' and that returns nothing.

Please advise.