Slack intergrated, but no any messages

Integrations
1

Hello there!
Sentry 21.4.0.dev0 on-premise (self-hosted).
Slack is integrated, inside Integtarions → Slack status is “Enabled”
I can create any rules for any project, added Sentry to my channel, but if I will generate test issue inside any project with rules - there is no any messages inside slack.
Why? How I can troubleshoot this problem?
Alert rule is quite simply:

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Thank you,
Best regards

2

And additional info - added email to this rule - it is not working too
added slack-webhook to this rule, and webhook sends slack messages with “Route not found” and generates this issue inside “INTERNAL” (but rule is not for internal)

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3

Nevermind, I’m accidently break sentry and slack integration seems ok. Just Sample Issues did not send anything to the Integration