But now we know that your IFTTT is working.
Do you run this in debug mode in mcStudio when connected to a mcModule?
If not, do that and also set some breakpoints in the code.
One on the raw that fetch the temperature and one the next line that creates a string and finally one on the raw that sends the IFTTT message.
Then you will see if the code actually run and also what value you are pushing to IFTTT.