Ford Sync 3 Unable to Connect to XB8

I recently upgraded from SVG2482AC to XB8.  I got 15 devices connected to WiFi, phones, tablets, printers, TVs, oven, car(25 Enclave).  Only one device was repeated failed attempts(21 Mustang).  I called Ford customer service.  They said the new WiFi 6 routers obosoleted the Ford Sync 3.  Check back in October 2026.  Ouch.  No biggie, I can download updates to USB.  Anybody have any luck with Sync 3?  Thanks