Good Day,
When an administrator adds or removes a registered participant from an event from the frontend, the participant does not get an email. Additionally, the administrator sees the following errors:

"Warning: The uuid of this booking was not correct and was newly generated, the customer maybe (if guest booking) has no more access to the booking in the frontend with the booking link!"

-AND-

"Error: The email failed to send!Invalid address (addAnAddress to):"

Please help. Thanks, Steve