Unfortunately, I’m not quite sure which part of my actions solved it but here’s what I did.
I created a new Tuya cloud project, added my devices like before and then reinstalled the HA integration with the new project. Then, it started working again.
hello, i have the same issue.
for me it helped to go to tuya, log in, then unlink the app, and relink it, scan the barcode with your tuya/smartlife app and thats it.
all tuya devices are back.
This worked as well for me. Only additional I would add is after scanning your QR code is go to HA>Settings>Tuya Integration>click 3 dots for menu>Reload
This worked. If you can’t find “Link tuya app account”, it’s a sub-tab under the Devices tab, not Overview. And in the phone app, there is a [|] sort of symbol (might be sideways) to invoke the camera to scan the code. And as RickyTickyTshirt said, you can then just reload the integration to repair it.