This is an ESP32 (including ESP32-S2 and ESP32-C3) / ESP8266 WiFi Connection Manager, using ESPAsyncWebServer, with fallback web configuration portal. Use this library for configuring ESP32, ESP8266 modules' WiFi, etc. Credentials at runtime. You can also specify static DNS servers, personalized HostName, fixed or random AP WiFi channel. With examples supporting ArduinoJson 6.0.0+ as well as 5.13.5- . Using AsyncDNSServer instead of DNSServer now.
I have no time to investigate this issue. It's possible installation-related.
I suggest you post the issue on the Platformio Forum to ask for support as many other people has been successfully using this library with Platform.io.
I don't think this is your problem - but there is a compile error
Do you have a solution?