Vivox: Why can't I join a 3d positional channel with my custom Vivox token (Vivox Unity SDK)?

Ensure your token follows the following formula:

sip:confctl-d-{issuer}.{channelName}{3dChannelProperties}@{domain}

An example would be as follows: 

sip:confctl-d-myissuer.lobby!p-32-1-1.000-1@mt1s.vivox.com

To grab these values from your channel 3d properties, follow the example below:

Channel3DProperties props = new Channel3DProperties(audibleDistance, conversationalDistance, audioFadeIntensity, AudioFadeModel.LinearByDistance);

string valueToAddToToken = props.ToString();