Centering is often an issue with the WiFi connection. 
requires a solid, but not necessarily fast connection at 2.4ghz. Many modern routers will have “smart switching” which will switch the connection out to a 5ghz which is useless to the Forge.
The easiest way to test that is to set up a hot-spot on your phone and run the WiFi connection again - if everything works than it’s your WiFi.
You can also try a manual reboot by shutting off not only the Forge but your router, modem, and any extenders you have in between - then turn on the modem, wait for it to complete its entire boot-up cycle - then do the same for router, etc.
Hopefully one of these gets you a quick fix. The centering process should never take more than a few minutes (and that’s only if there’s a major update it has to download), usually it’s under a minute.