Connect XBee S2C to Amazon Echo Plus

I am currently working on a ZigBee switch for home automation purposes with an XBee S2C and I'm trying to connect it to the Amazon Alexa Echo Plus.

my problem is, I can't connect my device to the Echo Plus via Zigbee.

I see the ZigBee Net in the X-CTU Network working mode but the Echo won't find the device and I can't connect to the Net.

What settings do I have to apply on the XBee? I already used the Home automation settings from DIGI and only found the Network but the Echo Plus still says there are no devices found.