Why do I see an "invalid meeting ID" error message?
You might have entered the ID wrong.
Try re-entering the 9-digit GoToTraining ID to see if you might have made a typo.
You might have the wrong meeting ID.
It's possible that the GoToTraining ID you have is incorrect. Try contacting the organizer who invited you to the training and asking for the correct GoToTraining ID.
The training might be expired.
The training ID might be from a past GoToTraining that already expired. Try contacting the organizer who invited you to the GoToTraining and asking if there is an updated session you can attend.