When a Request Status is changed to cancelled or deleted, a notification email is currently sent to everyone in ttRequestRoleUser.

A frequent customization on the client implementation is to replace the existing functionality and only send a cancelled or deleted workflow notification to the user that submitted the Request (ttRequest.SubmittedBy).

If the Request is a child Request of the parent, we use the SubmittedBy from the parent since the child Request has SubmittedBy = 'process'.