Unable to join Tour de Oz

I was unable to join Tour de Oz event (TDO) this morning, but was able to join any of the other listed events listed.

There was no response when clicking to join the TDO.  No problem when attempting to join any of the other events that were listed with the TOD event.

Attempted to join both before the event started and post start time.

Restarted PC and app, reconnected devices no probs, but there was no response when clicking the join button for TDO. 

Could see that other riders were able to join as the participant #'s had increased between each re-connection of app or restart of PC.

Subsequently, I was able to ride around London on my own without any issues.

So? what gives? am I banned or something from TDO?

Thanks Zwiftless.