Cannot answer call on iOS on killed state (sendbird_calls_react_native.RNCallsInternalError error 4.)

I cannot answer the call when app on killed state (iOS),

i’ve followed this instruction Receive a call in the background | Calls React Native SDK | Sendbird Docs

SendbirdCalls.getDirectCall works fine on foreground and background, only problems on killed state

i use try catch on SendbirdCalls.getDirectCall and i got this error
[Error: The operation couldn’t be completed. (sendbird_calls_react_native.RNCallsInternalError error 4.)]
i cannot find this error anywhere Error codes | Calls React Native SDK | Sendbird Docs

@Jason1 could you confirm if you have background fetch and VOIP has been enabled in XCode capabilities?