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Connecting a Smart Wireless Temperature Sensor X to the bridge

Dear community,

I joined newly the Tado community.

At home, I have installed so far 4 Smart Radiator Thermostat X and one Bridge X. My first impression were OK. I wanted to add Smart Wireless Temperature Sensor X to have a more accurate temperature measure. During the installation in the app, I receive a failure "Thread border router erforderlich" (Thread border router needed). The bridge X is operating.

What can be the issue?

Thanks for any help!