I have a user who went to Sign-up for a Seminar activity > Event. She got a message saying she had a conflicting sign up.

She believes it is because she is the Editing Trainer for a course that also has a Seminar activity > Event that conflicts with the same date/time.

? What is it that triggers a user getting the conflicting sign-up message? 

? If a user has the role of Editing Trainer in another course that has a conflicting Seminar activity > Event as an activity in that course, does it create a conflict even if the Editing Trainer is not signed up as an attendee for the Seminar activity > Event in their own course?

In case I made that less clear - :-). Here is example:

Susan is the Editing Trainer for Course A. Course A has a Seminar activity > Event on Thursday, May 7, 2020 at Noon-2PM America/Denver time.  Susan is not listed as an attendee for this Event. Other Trainers are going to attend and manage the Event.

Susan wants to attend a Seminar activity > Event in Course B. That Event in Course B is also being held on Thursday, May 7, 2020 at Noon-2PM America/Denver time. Will Susan get a sign-up conflict automatically if she tries to sign-up for the Event in Course B. Is there a Seminar activity or Event setting that would preclude the conflict?

Many, many thanks in advance for your help!