Radio remote control needed help!

Hello together, I know that there are already countless threads on this topic, but unfortunately the day-long research has not helped me so far. I am recently proud owner of a Volvo 850 Metropolitan from 1996. In the car itself is a FunkZV installed, no alarm system. Since I did not know this until the development of the glove compartment, I bought a used FunkZV box with two handheld transmitters and wanted to learn this as so often described with 5 times ignition 0->2. Unfortunately I have not had any success with it so far. No matter whether fast, slow or whatever. I certainly tried the 20 times, resultless. Also the support of Volvo or a dealer in my vicinity could or did not want to help me…. Does anyone still have an idea? It would be a dream to be able to open the elk on the pocket… Thanks for your support!