Howlies Ryujin.W.Tyrrell,
It sounds like this maybe the issue. Please let us know if this resolves the problem for you.
Allow App Installations from Unknown Sources - Samsung
Your device and personal data are more vulnerable to threats such as Ransomware from apps downloaded from unknown sources. Here's some additional info about downloading from unknown sources and protecting your device against Ransomware.
- Open the Settings app .
- Tap Apps .
- Tap the Menu icon (upper-right).
- Tap Special access then tap Install unknown apps .
- Select the unknown app then tap the Allow from this source switch to turn on or off