Hi folks, since I'm having some problems with setting Slack Notifications let me ask, is it normal that when I access my WEBHOOK_SLACK_URL on the cloud I can't visualize it?

Once you set a secret, it's hidden for privacy/security reasons. If you want to get the value of the Secret, you can go to the Interactive API and run the following query:

query {
  secret_value(name: "SLACK_WEBHOOK_URL")
}

Does this answer your question?

Yeah it's fine, at least I know it's not a problem from Prefect side. I'll investigate a bit more and eventually write something in #prefect-community if I won't be able to solve the problem. (Tx)