Slack has recently released a new Workflow Builder version which is incompatible with apps that were built for the original version. Only a few apps have built steps for the new version, and the Fellow team is working on building the steps for it in the near future as well. In the meantime, you can setup automations to Slack using our meeting automations instead! Automations can help with reminding participants to contribute and review the agenda, cancelling the meeting if there is nothing to talk about, or sending out a recap afterwards.