New member announce doesn't work in #community

[kylemh]

Bug Report

What is the current behavior?

New users are sent a PM from Slack bot, but #community is not given the opportunity to greet them nor click the button confirming that they've been greeted.

What is the expected behavior?

When a new user joins the Slack team, a message indicating that they've joined should appear in #community. That message should also include a button that - when pressed - indicates that a new user has been greeted by a team member.

What steps did you take to get this behavior?

Made sure that new members were greeted via automated PM, but noted the lack of activity in #community
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