Workplace - Reservations - Booker doesn't receive ICS file in Email
The Users
Booker = The logged in user making the reservation
Organizer = The employee specified in the Organizer field
Attendee = A visitor added below the Organizer field
The Emails
1) The email with ICS attachment will go to the Booker and Attendees as long as an at least 1 attendee is added.
2) The email without the ICS attachment will go to the Organizer and Booker if no attendees are added.
To remain consistent, my suggestion is for the Organizer, Booker, and Attendees get an email in both cases and for the ICS attachment be included in both emails.

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Martin Cubito commented
Hi team, how are you doing?
I would like to add a comment.
In the case 1 ("The email with ICS attachment will go to the Booker and Attendees as long as an at least 1 attendee is added"), the email that is received by the booker is the same that is received by an attendee. The body email says "You have been invited by (booker username)..." but the booker is the reservation owner, he is not an attendee, so the booker must not receive this email.
In this case the body email received by booker must be different, it must be like the email in image Reso_email_whitout.ICS.png attached (because he carried put the request for reservation), and the .ics should be attached on that email.Thanks.
Martin.