Here is how to troubleshoot Gmail Label Sharing issues:

  1. Log into your Gmail account at https://mail.google.com.
  2. Go to your Gmail settings, select “Forwarding and POP/IMAP” (the direct link should be https://mail.google.com/mail/u/0/#settings/fwdandpop).Please verify the following:
  3. Enable IMAP should be selected.
  4. Do not limit the number of messages in an IMAP folder should be selected:
    Gmail IMAP
  5. Save the above settings.
  6. Go to the “Labels” tab (the direct link should be: https://mail.google.com/mail/u/0/#settings/labels).
  7. Verify that the label you are sharing has “Show in IMAP” enabled:
    Settings_-_senad_dizdar_cloudhq_net_-_cloudHQ_Mail
  8. Verify that both “All Mail” and “Trash” have “Show in IMAP” enabled:
    show in IMAP