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[J.Soko (Joachim Sokolowski)]

Try the new beta Tuya integration:

Tuya Issue - Switch works in Smart Life App but shows offline at https://iot.tuya.com/

And here ist the solution: Tuya has provided an easier and improved login method for Home Assistant users. Having a developer account with Tuya is no longer required; instead, you can scan a QR code with your Tuya Smart of Smart Life app to authenticate it with Home Assistant. After the upgrade, Home Assistant will ask you to re-authenticate your Tuya Smart or Smart Life account using the new method. See also this thread: