Messages: seeing messages from non-apple devices
I have two computers active on my desk - one for work, one personal, both running MacOS Sequoia. In the Messages app, I have a group chat with participants not using Apple devices. I can see the chat properly on my iPhone, and on my work computer, but not on my personal computer. As far as I can see, Messages is set up identically on both computers. Why wouldn't the chat show up in Messages?
Mac mini, macOS 15.3