Happy to try and help if I know at what point its failing.
Note my update: Tuya doesnt support the Yaml any more and you have to configure each DPS using the Tuya Local.
Just so I know where you are up to . If you have Tuya local setup and you should see following in your HA intergrations.
If you havn’t already then you use ID and local Key when you add a new device by selecting Configure.
Click Submit
If everything is set correctly on your Tuya IoT Platform. you should see your device in the list to add.
Sorry Can’t show you mine as they are removed from the list when successfully installed.
The basic workflow is.
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Connect to WX8 via Tuya smart app (Sound like you have done this)
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Setup Tuya IoT Platform to connect the device (You have Key and Id so assume you have this)
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Install HACS and Tuya Local
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Add Device using Configure
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Edit Device using Configure to add the DPS
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Create a sensor if you need it but this is not essential
If you could give me a sense of what point you have working I’ll see if I can help