Hi @dlbhilbig Thanks for reaching out about this! I checked internally & it looks like we intentionally removed this option, as it is no longer recommended by Slack. However, it looks like you could work around this limitation by using the generic REST API. Do you think that could work for your instance?
The old Slack integration linked to this warning on Slack:
Technically, the old integration is still available by changing the URL from /resources/new/slackopenapi to /resources/new/slack, but I'm not sure how long that will be the case. Established resources using the old integration will continue to work though!