Pepwave BR Max MK2 LTE - IP Range Issue

I’m testing the BR Max MK2 as a wifi client in an existing Wifi Network, which is working fine. I’be vonnected the BR Max via ethernet (LAN Port) to a PC. My problem is, that the existing wifi has IP Adresses in the 192.168.200.xxx range. The PC that is connected to the BR Max MK2 gets a 192.168.50.xx address.
I can ping a pc with the ip 192.168.200.75, but this pc cant ping the 192.168.50.xx pc. For my use case I need to somehow get the pc with the BR Max MK2 in the 192.168.200.xx range, because I want tot stream data via RTP.
I’m new to the the whole networking space so sorry if the question is basic. Would be grateful for any advice.

Thank you