title: kubectl "error: You must be logged in to the server (Unauthorized)" using kubectx, while no error if used the same config directly
body: <p>I am encountering a weird behavior when i try to configure several KUBECONFIG environment entries concatenated with <code>:</code> such in the example here :</p>
  
  <pre class="lang-sh prettyprint-override"><code>export KUBECONFIG=/Users/user/Work/company/project/setup/secrets/dev-qz/users/admin.conf:/Users/user/Work/company/project/setup/secrets/dev-wer/users/admin.conf:/Users/user/Work/company/project/setup/secrets/test-wer/users/admin.conf:/Users/user/Work/company/project/setup/secrets/test/users/admin.conf:/Users/user/Work/company/project/setup/secrets/dev-jg/users/admin.conf:/Users/user/Work/company/project/setup/secrets/preprod/users/admin.conf:/Users/user/Work/company/project/setup/secrets/dev/users/admin.conf:/Users/user/Work/company/project/setup/secrets/dev-fxc/users/admin.conf:/Users/user/Work/company/project/setup/secrets/cluster-setup/users/admin.conf:/Users/user/Work/company/project/setup/secrets/test-fxc/users/admin.conf:/Users/user/Work/company/project/setup/secrets/test-jg/users/admin.conf:/Users/user/Work/company/project/setup/secrets/test-qz/users/admin.conf
  </code></pre>
  
  <p>This is what is happening: if i choose with <code>kubectx</code> the cluster (not every cluster from the list, but just any), when i try <code>kubectl get po</code> i receive : <code>error: You must be logged in to the server (Unauthorized)</code> . 
  But, if try to reach the same cluster passing it directly to the kubectl command with <code>--kubeconfig=&lt;path to the config&gt;</code> it works.
  I am pretty struggling with this and just wanna know if anyone else is facing this kind of issues as well and how have solved it </p>