My issue is trying to complete Course1. Attempting to send message in Notifying the team section and building the workflow in Course 1 is unclear.
I created the Slack app and authentications, get a positive test yet do not see the message in Slack. Also the course instruction does not match the options to select. See pic.
Can you share the workflow you are using? It may be worth noting that to complete the course fully you will also need to send the message to Discord even if you are testing with Slack.