Greeting might not be sent to all new users.

[JnBrymn]

Steps to repro in dev

Assumes you have your QA slack working.

1. set up the dev passthrough
2. Create a temp email address
3. Invite that email to your slack
4. As the temp user receive the email and sign up
5. The new user will see no greeting message and there will be no HOOK> log lines for that user joining general.

It's as if we don't get the #general channel_join message from slack for the new user. BUT that said, we have evidence of a user recently filling out their form in production, so how did they get it?

I thought maybe the auth settings were the problem, so I uninstalled my app, re-did the auth tokens, and reinstalled it. I repeated the steps above, but it still didn't work.