I just purchased an Eversolo DMP-A6. Roon does not find it as a network device.
Describe your network setup
T Mobile 5G Gateway into TP-Link RE450 extender into TP-Link ethernet hub into two way ethernet switch, one lead to DMP-A6 the other to Mac mini running Roon core.
Welcome to the community! We’re excited to have you here, but apologize it’s an issue that prompted your first post.
Following up on @Suedkiez’s response (which may likely solve your issue) it may also be helpful to simplify your network chain as well - see if you can get a direct hardwire connection from your Mac to your primary router.