I am creating a training signup. The trainings are in a custom list as list items. I have two workflows on this custom list both in SPD. My first workflow creates a calendar event upon creation of a new list item. My other workflow is called Add Participant which adds a participant to the list item and sends them a calendar invite to the training. In this first workflow I would like it to also populate a column upon creation of the list item in each list item with a hyperlink to be able to run the Add Participant workflow directly. Then I would like to create a display template to bring in the columns and create a button out of that hyperlink so that when a user views the page with all available trainings, it has a signup button that starts the Add Participant workflow.
What I'm running into is that I can not find the link to that manual start of the workflow in SPO. I have read previous posts from what appears to be 2007 and 2010 SP, but SPO doesn't appear to be calling a link. Anyone have any ideas on how to get this link or how to kick off this workflow?