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Answer
The JOIN EUI, formerly referred to as the "APP EUI" has been renamed by the LoRaWAN Alliance, as it identifies the Join Server. This EUI can be configured the same across multiple devices, to identify which specific join server the device is to be linked to. It consists of an EUI64, 64 bit (8 byte) identifier.
Because the JOIN EUI is configurable (can be modified) by the end user, it is not included on the packaging of the sensor. A default JOIN EUI is configured at the time of manufacturing. For standard RS1xx products, any sensor/sensor kit assembled after date code: 0223451 will be configured with the current Manufacturing JOIN (APP) EUI of ECC07A0000000006. Any sensor/sensor kit assembled prior to this will be configured with the previous Manufacturing JOIN (APP) EUI of F9C60ECEA3ADC6BD.
The default JOIN EUI (APP EUI), can also be found in the RS1xx User Guide, section 4.1.1, or via the RS1xx Sentrius Sensor App available from the Google Play Store or Apple Store.
Additional information for this product can be found on the Sentrius RS1xx Product Page.
*Note: Custom RS1xx products have their own unique JOIN EUI and do not use the default JOIN EUI found in the User Guide.