@Marvin Why can't I find the Slack Incoming Webhook block in my new Prefect account?

The "Slack Incoming Webhook" block should be available to use in your Prefect flows to send notifications to Slack. However, if you can't find it in your new Prefect account, it's possible that it's not set up or visible in your current workspace. To use a "Slack Incoming Webhook" block in Prefect, you typically need to create a Slack Webhook URL through Slack's app configuration and then use this URL within your Prefect flows. For detailed instructions on how to create a Slack Webhook URL for the Slack Webhook Notification Block (Incoming Webhook), you can refer to this discussion on Prefect Discourse. If you need further assistance or have followed the instructions and still can't access the Slack Incoming Webhook block, please let me know, and I can assist you further.

I couldn't create the block via the UI, but when I programmatically created it, it worked as expected.

@Brian Roepke have you tried registering it for use in the UI?

Interesting! I didn't know or think of that - however, now that I've created one programmatically it shows up in "add block" where it didn't before.