LEX Summary Report.
Error: System.HttpResponse[Status=Bad Request, StatusCode=400] [{"actionName":"Session_Scheduler","errors":[{"statusCode":"UNKNOWN_EXCEPTION","message":"The input parameter varWednesday can't accept values of type String.","fields":[]},{"statusCode":"UNKNOWN_EXCEPTION","message":"The input parameter varTuesday can't accept values of type String.","fields":[]},{"statusCode":"UNKNOWN_EXCEPTION","message":"The input parameter varThursday can't accept values of type String.","fields":[]},{"statusCode":"UNKNOWN_EXCEPTION","message":"The input parameter varSunday can't accept values of type String.","fields":[]},{"statusCode":"UNKNOWN_EXCEPTION","message":"The input parameter varStartEndDateTime needs to be in this format: YYYY-MM-DDThh:mm:ssZ.","fields":[]},{"statusCode":"UNKNOWN_EXCEPTION","message":"The input parameter varStartDateTime needs to be in this format: YYYY-MM-DDThh:mm:ssZ.","fields":[]},{"statusCode":"UNKNOWN_EXCEPTION","message":"The input parameter varSaturday can't accept values of type String.","fields":[]},{"statusCode":"UNKNOWN_EXCEPTION","message":"The input parameter varMonday can't accept values of type String.","fields":[]},{"statusCode":"UNKNOWN_EXCEPTION","message":"The input parameter varFriday can't accept values of type String.","fields":[]},{"statusCode":"UNKNOWN_EXCEPTION","message":"The input parameter varEndDate needs to be in this format: YYYY-MM-DD.","fields":[]}],"isSuccess":false,"outputValues":null}] System.HttpRequest[Endpoint=callout:Mass_Action/actions/custom/flow/Session_Scheduler, Method=POST] { "inputs" : [ { "varWednesday" : "false", "varTuesday" : "true", "varThursday" : "false", "varSunday" : "false", "varStartEndDateTime" : "9/20/2018 1:00 AM", "varStartDateTime" : "9/20/2018 9:00 AM", "varSaturday" : "false", "varMonday" : "false", "varFriday" : "false", "varEndDate" : "10/19/2018", "varCourse" : "a0j6A000003jS4v" } ] }
The days of the week fields are all boolean. I can reformat the Formula: Last Day Next Month to a Text field with the proper syntax, currently it is a Date field.