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Hi CT83, There shouldn't be an issue with your SSID, underscores and full stops should be fine. Though if there is a connection issue it will fall back to the hotspot which is probably the issue.
You can try running the autohotspot script manually and you will see feedback and any issues. The first part shows the SSID's it is checking from wpa_supplicant so you will see if your SSID is being checked in full. If not then that is the issue.

As a test if you use the manual SSID feature near the top of the script
#ssids=('mySSID1' 'mySSID2' 'mySSID3')
change to
ssids=('CT83_WiFi_2.4G')
then comment out the lines ablve with a #
#wpassid=$(awk '/s..........
#IFS=","
#ssids=($wpassid)
#IFS=$IFSdef

This will stop checking wpa_supplicant and use the manual entry, so the format is not an issue.

If that works the I can only suggest you change the SSID, if possible, and reverse the changes.

The RapiConfig and wpacli will fail because wpa_supplicant is not running.

One other to check is if you have created your wpa_supplicant file manually has it got the correct config at the top? If not the connection will also fail.

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=GB

let me know how you get on and let me know the details if you have further issues.