Ensure the Zebra Browser Print app is installed, running (tray icon), and you’ve accepted the SSL certificate in your browser (open the service via buttons above, proceed, then retry).
In Browser Print settings (tray icon → Settings), enable Broadcast Search to discover network printers.
Try another supported browser (Chrome/Firefox), then click Service Check to verify the service is reachable.
These change printer-stored variables. Use 104 mm or BobGo Mode before switching to BobGo if their job doesn’t send its own width.