I’m feeling unusually stupid atm… I have added:
https://download.smarthomej.org/addons-snapshot.json
to the “Json 3rd Party Add-on Service” setting. It said somewhere that you should use that for OH4, instead of just addons.json. So let’s start there: which one is correct? I tried both with the same error.
And now for the Bindings installation menu: I only see “openHAB Distribution” and “Community Marketplace”. When I search for “tuya”, I get one hit. WHICH I know realize, gives me an entirely different Binding called “Smarthome/J Tuya Binding support for WIFI TUYA Energy Meter 63A”
So sorry about this, entirely my fault for not noticing this before. I couldn’t see the “Other add-ons” option, but I have now found the option that enables it and can now see the plugin.
And it installed fine. Thanks for pointing out some details which lead me to figure out the problem.