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TADO X head: non connecting

Hi

I've bought a TADO X Smart Start Kit (2 heads + Bridge + Thermostat)

No way to have the 2 Heads connected (the Bridge is in the same room as the 2 heads)

I've also bought (separately) n. 4 Heads TADO X (installed in different rooms) and I have connected them without any probelm (same WiFi, same Bridge, same Phone as previous ones).

How is possible?

Could be that the 2 heads included in the Start Kit are broken?

Thanks for any support!