Hi @fegrasso and @ardudenny. Thanks for your interest in Arduino Cloud OTA uploads with the UNO R4 WiFi board.
There isn't support for OTA uploads to this board currently. You can learn which boards are supported by checking the list in the Arduino Cloud documentation here:
https://docs.arduino.cc/arduino-cloud/features/ota-getting-started#supported-arduino-boards
There is also some discussion about the addition of OTA support for the UNO R4 WiFi in another forum topic:
So I would recommend you watch that topic in order to get notifications of any news on the subject.