I have a flow that is designed to post a message to a channel using "Send HTTP Request". I am doing it this way so I can tag the channel, as the regular "Post a message in a chat or channel" does not allow you to tag the channel.
Anyway, I have the flow setup as seen below. I am able to get it to function perfectly without the href, but whenever I add the href I get the error: "Unable to read JSON request payload. Please ensure Content-Type header is set and payload is of valid JSON format."
I have checked what I can for JSON, compared what I have to hyperlinks that work when flow posts on its own using "Post a message in a chat or channel", and it all lines up.
Any help would be appreciated.