Most tape based cameras are compatible with iMovie even if they are not displayed on Apple's compatibility list.
On the other hand, importing mini-DV video with iMovie has shown to be not always reliable. It works for some cameras and not with others.
Faulty cables or adapters account for many instances where iMovie will not recognize the camera. If the cables and adapters are not Apple you might try replacing them. Check that your cable connections are tight. Also, in case the Thunderbolt slot on your Mac is faulty, you might try switching to another slot.
Another tip is to start the camera and the tape running before beginning the import. Sometimes that triggers recognition.
-- Rich