Not able to connect to APs with Underscore(_) and Space( ) characters in their SSIDs

[sameer7in7]

After flashing the firmware on the esp8266 board, and then setting the SSID and PASSWORD of the AP which the board will connect to, the board simply does not connect to the AP if there is an Underscore or Space character in the SSID. The range is not the problem here, as the AP was my phone which was sitting next to the esp8266, neither there the phone is set to 5Ghz band, and neither the phone is set to use WPA3.