Tuya Thermostat "not available" / "nicht verfügbar"


I have just started my first Home Automation (HA) project and am still quite inexperienced. Unfortunately, I haven’t found a solution in various blogs and hope you know one.
I have a thermostat from Tuya, and I can control it through the Tuya app. I have also integrated it into Home Assistant (HA). However, in the dashboard, the thermostat is shown as “not available.”

Thank you in advance for your help!

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Same issue here.