I've had an internet outage and afterwards my Android 9 Xiaomi smartphone did not see my SSID at all in the system WiFi list and in the WiFi Analyzer app. My phone only supports 2.4 GHz WiFi, whereas other devices use 5 GHz. 2.4GHz is on on the router.
The SSID Broadcast is on, I even tried setting the SSID on my phone that didn't work.
I tried setting the channel to 9 and 5 correspondly without any avail (as discussed here The SSID of my WiFi is not appearing in the list of neighbor networks ).
All my other devices have no issues.
Any help is very appreciated.