Bme680 init failed ! can't find device!

I installed Arduino Uno R3 with Base shield and the sensor BME680 from Seeed, all as explained on the precise description here. But sensor is not responding, I get the message “bme680 init failed ! can’t find device!”. The library is the one given on Github and the sketch example is named “Seeed_BME680_test”. I did nothing more than following instructions.
I also tried the optional address 0x77 but same result.
I tested I2C address and can read sensor on the correct address 0x76.

I am not coding specialist, so where is the bug?
Any suggestion would be very kind!
Thank you.