Error 0x80EE003C

Value: -2131886020 | 0x80EE003C | 2163081276

What does it mean ?

RTC_E_PROFILE_INVALID_SESSION_PARTY  
Invalid session party in profile
Value: 60 | 0x003C | 0b0000000000111100

Where does it come from ?

FACILITY_RTC_INTERFACE  
RTC - Real-time Communications
Value: 238 | 0x0EE | 0b11101110

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