Hi @Matteo_Hary!
IFTTT support reffered to Nuki fails to trigger IFTTT - no error message, which we could solve yesterday afternoon. They also informed us about an Opener inquiry like yours, which could be due to the same reason. Please recheck the delay on your service in the next days and get back to us if you still see the same issues for your Opener!
An alternative would be to use our Bridge HTTP API to send callbacks to a local Smart Home system.
wbr,
Stephan