So, I just factory reset my Si500 to try and verify.
I have LTE RM and RM Device Monitor up on my box so I can see both. RM Device Monitor is configured to use both USB and Wireless. The Si500 unit is defined in LTE RM but no configuration selected/assigned. For this round of testing, I was *NOT* USB connected because my desktop and the dedicated programmer box are about 20 feet apart.
When I scanned the QR Code the unit completes "Network Connected" and "Configuration Saved" but "hangs" on "Connecting to Radio Management". *HOWEVER* RM Device Monitor did report the Si500 as contacting it but no jobs pending.
I then assigned the configuration I had created to the Si500 entry. Nothing happened immediately.
The instant I finished scheduling the write job on the Si500 entry, LTE RM / RM Device Monitor pushed the config to the Si500 and the device, after a few seconds, said the config was complete and offered a reboot. Upon reboot the device was up and running.