Question about Philips 346B1C/00

Dear Community I need your help as not even Philips can help me. I have connected the screen to my laptop via USB-C, but there is no picture. I get the message "No video input signal". Philips told me that I don't need to do anything else and that the screen is therefore defective. They sent me a new one. Same problem with the new one, of course. I'm no dummy and I always help people in the shop with minor IT problems, but this is beyond my knowledge - I don't know what else I can do and I'm getting desperate. Here's the problem: I have a 2021 MacBook Pro and a Lenovo for business. I really want to be able to use the monitor's docking station as I bought the monitor specifically for this purpose. Which cable do I need to use for the connection? USB-C on the monitor is already clear. But what at the other end; USB-C to USB-C? (this was not included with the monitor 2x and was subsequently supplied by Galaxus). So I find it strange to use a cable that is not supplied as standard. Do I need an additional driver or is the cable connection usually sufficient? When I connect via cable, "video signal" is simply not recognised. Do I need to make any other settings? Please provide step-by-step instructions. Thank you very much!