JAVASCRIPT

(Unauthorized) not authorized on admin to execute command

use admin;
db.grantRolesToUser('admin', [{ role: 'root', db: 'admin' }])

(Unauthorized) not authorized on admin to execute command

use admin
db.createUser(
  {
    user: 'admin',
    pwd: 'password',
    roles: [ { role: 'root', db: 'admin' } ]
  }
);
exit;