MQTT on Cerbo GX it stopped working

Good evening everyone, I hope this is the right place but I have a problem with MQTT on the Cerbo GX from local. It only gives me a “Disconnected from server” after a certain timeout. Some time ago, however, it worked for me.
The only change is that I installed the driver for MQTT Shelly EM as in:

which always gives me this log:
2024-12-23 19:28:05.844935500 WARNING:root:MQTT client: Got disconnected
2024-12-23 19:28:05.845741500 WARNING:root:MQTT client: Unexpected MQTT disconnection. Will auto-reconnect
2024-12-23 19:28:08.520077500 INFO:root:Waiting 5 seconds for receiving first data…
2024-12-23 19:28:13.524039500 INFO:root:Waiting 5 seconds for receiving first data…
2024-12-23 19:28:14.012380500 ERROR:root:MQTT client: Failed to connect, return code 5
2024-12-23 19:28:14.012388500

Can you give me some clues where to look for the causes? Thank you and Merry Christmas everyone