OK. I just confirm that your user account is in the OCHA server i.e. https://kobo.humanitarianresponse.info/ while your friend’s account as well your other friends account both are in the HHI server i.e. https://kf.kobotoolbox.org/.
Solution for your issue would be as stated above, all of your user account should be under the same server whether it be an OCHA server or it be an HHI server.
