My company is using MaaS360. I had to change the setting for "Allow Installation of Non-Google Play Applications" to user controlled from Blocked to user controlled. This immediatley fixed the issue for the galaxy app store apps. I would ask the MDM administrators if they have a similar setting. We blocked this as a basic security measure since we did not want employees installing random apks or applications from more unsecure app stores and now have to deal with this possiblity and how to reduce this risk. Samsung doing their own thing and creating their own app store might be good for consumers, but will lose them our buisness because of this risk or we be at least removing/disabling all these built in apps for alternatives on the google play store.
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