Add buttons to IR device

I want to add my kitchen hood Witt WSU90S as an IR device. But when i try to copy from the remote I get this: “These buttons Homey already knows”.

The thing is this is my first device. Nothing happens when i press "Test. And if i click finish, the button is not added to the IR device. Can someone please help me?

I have the same problem. Homey indicates to know the buttons already… resulting in a device with no controles.

If homey already knows the ir signals, how can I access these? I tried the IR library but i cannot find them through the name of the product/ vendor