I was messing around trying to activate the 3CX Hotel Module with the Demo License Key SAOY-****-****-GLJV. It failed, saying duplicate key or something.... then I removed the Demo Key from the 3CX PBX and tried to activate the Hotel Module again.. it failed again. Now... trying to put the demo key back into my 3CX PBX and get the Error: 3CX Interface Unexpected error: License Key Is In Use Already License 27 68 System: 2.0 What happened? Can get back to the demo features. BTW... 3CX Hotel Module requires a different demo key, which I got and it works.