AutoConnect module does not broadcast SSID on ESP32 Dev Board
It looks like your ESP32 is already successfully connecting to an access point as a STA (station) and does not start its own Access Point (AP). You probably have already previously configured an SSID and password and the ESP32 is successfully reusing those, so it will not start the Captive Portal (as its own AP).

You should force AutoConnect to start up the Captive Portal or to forget its pre-programmed SSID and password. This can be achieved by On-demand starting of the Captive Portal like described on this page. According to the documentation you should put the following lines in your code (I have not tested this myself):

Config.autoRise = true;
Config.immediateStart = true;
Portal.config(Config);
....
Portal.begin();


NOTE: The documentation actually states Config.autoRise = false but it seems this does not have the desired effect.