Xiaomi Smart Home Gateway Setup

So my .things file looks like this:
I have plenty of other child devices, but the rest got detected by the paper UI.
Even though they are online and they don’t throw any errors or exceptions in the logs, I don`t receive any data from these Sensors.
Does someone has a Idea?
I’ve double checked the values I’ve used from the mi home app. They should be correct.

Bridge mihome:bridge:7811dcb3XXXX "Xiaomi Gateway" [ serialNumber="7811dcbXXXX", ipAddress="192.168.178.85", port=9898, key="yrncha8voy5kXXXX", pollingInterval=6000 ] {
Things:
gateway			7811dcb3XXXX	"Xiaomi Mi Smart Home Gateway 2. Versuch" 			[itemId="7811dcb3XXXX"]
sensor_cube 158d00027XXXX "Xiaomi Cube 1" [itemId="158d000278XXXX"]
sensor_cube 158d000256XXXX "Xiaomi Cube 2" [itemId="158d000256XXXX"]
}