Feature code 7777 not working

I’m running FreePBX 2.10 and have noticed feature code 7777 no longer gives me the simulated call. Instead it gives me a recording saying The number you have dialed is not in service. Please check the number then it disconnects.

I attempted to change it from the standard 7777 to *777 just to see if that made any difference but it does not. Other feature codes don’t seem to work either. For example I can’t answer a ringing extension by pressing *8 (screen says that feature is not allowed). Or *34 (that feature is not available).