Slack API returned an error `method_deprecated.

[fbettag]

so i am trying out the basic Hello bot with Slack but all i keep getting after the start_link/3 is:

        ** (MatchError) no match of right hand side value: {:error, "Slack API returned an error `method_deprecated.\n Response: {\"ok\":false,\"error\":\"method_deprecated\"}"}

[luanzhu]

+1, got the same error

Looks like it is related to authentication change?
https://api.slack.com/changelog/2021-02-24-how-we-broke-your-slack-app