Unable to log in via mobile app, but able to log in on desktop/web

Unable to log in via mobile app, but able to log in on desktop/web

I was having this issue, a repeated issue which one of my user couldn't log in to his account via the zoho mobile app. This is the error: http://prntscr.com/iwu8zo "You need administrative permission to use this app"

However, he was able to log in via desktop/web. To temporarily solve this problem, we had to reset the user's password and the next minute he could log in via mobile app. Any clue?