Hi @mixpc,
please make sure to erase your ESP8266’s flash before uploading the environment described above.
It sounds as if you still have some previous, possibly only partial WiFi/MQTT settings stored in flash which the ESP8266 is trying to connect to, hence not starting WiFi Manager.
To verify, instead of just uploading, chose Upload and Monitor. There you will see if it tries to connect to WiFi or an MQTT broker. What you should, and very likely will see after a flash erase, will be something like:
N: Connect your phone to WIFI AP: OpenMQTTGateway_ESP8266_RF with PWD: your_password
…
*wm:[1] StartAP with SSID: OpenMQTTGateway_ESP8266_RF