How to turn off random MAC addresses in most devices running Android:

Ensure the device is connected to the TigerNet network. 
Navigate to Settings.
Tap Network & Internet/Connections and then WiFi. 
Tap the gear icon associated with TigerNet.
Tap Advanced and then Privacy.
Tap Use Device MAC.

How to turn off random MAC addresses in Samsung Galaxy devices running Android:

Ensure the device is connected to the TigerNet network. 
Navigate to Settings.   
Tap Connections and then WiFi.                                                                                                          
Tap the gear icon associated with TigerNet. 
Tap “view more” if applicable.                                                          
Tap MAC address type.
Choose Phone MAC.