Retreive Audio Workgroup in iOS

Hi!

I am working on an audio application on iOS. This is how I retreive the workgroup from the remoteIO audiounit (ioUnit). The unit is initialized and is working fine (meaning that it is regularly called by the system).

os_workgroup_t os_workgroup{nullptr};
uint32_t os_workgroup_index_size;
if (status = AudioUnitGetProperty(ioUnit, kAudioOutputUnitProperty_OSWorkgroup, kAudioUnitScope_Global, 0,
                                    &os_workgroup, &os_workgroup_index_size);
      status != noErr)
  {
    throw runtime_error("AudioUnitSetProperty kAudioOutputUnitProperty_OSWorkgroup - Failed with OSStatus: " +
                        to_string(status));
  }

However the resulting os_workgroup's value is 0x40. Which seems not correct. No wonder I cannot join any other realtime threads to the workgroup as well. The returned status however is a solid 0.

Can anyone help?