Unable to join event

Tonight I had registered to join an event and was riding in the game 15 minutes before it was due to start but I never got the prompt.

When I missed that race I registered for another staring 30 minutes later but I never got the invite for that one either.

Can anyone explain why this might have happened?

I was riding a TT bike and I am not sure it they were events where TT bikes were allowed, would that have made a difference?