Hi Jen,
If you cancel their registration they would need to register again, you can prevent this by editing the registration settings for the training and setting it to manual approval. If you dismiss them from the live training they could potentially join again unless you also change the registration to manual approve and then deny their original registration.
http://support.citrixonline.com/en_US/training/help_files/G2T020006?title=Share+Trainings%2C+Manage+...
Glenn is a member of the GoTo Community Care Team.
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