I'm using flow designer and using slack's Post Message to send a message to slack with a button which is a link.
Everything is working. The button is clicked, the browser opens the webpage. It does exactly what I expect, but slack complains after the page is loaded. The same block went sent via block-kit-builder is working as well, but doesn't complain.
Any idea why this might be occurring? The error message is "This app returned an error. Please try again, or contact the app's developer." Given that the error only occurs when sending it via ServiceNow, is this an issue with the app?
