I recently went through this fun. I don’t have a lot of extra cycles to dig out the related threads, but the Hue Emulation binding was “rewritten”.
If you are only getting Lighting tagged items, there is a workaround of adding the Switchable flag to the White Items config line. Note the CASE and the no space “Lighting,Switchable”.
Note that the NEXT step will remove devices from your Routines if you have any defined in Alexa Smart Home.
Then using the Alexa website (alexa.amazon.com), make sure you’re logged into the correct profile if you have two or more. Navigate to Smart Home → Devices. Scroll all the way to the bottom and select [Forget all Devices].
Enable the Device Paring slider in Paper UI. And Ask Alexa to “Discover My Devices”
With the added Switchable flag, OH2 should serve up the devices to Alexa.
Good Luck!