We have pushed an update that addresses this to all accounts.
Posted Jul 07, 2017 - 14:09 UTC
We'll be releasing an update to address this shortly. You will be asked to refresh if you're logged in.
Posted Jul 07, 2017 - 13:55 UTC
Some users are unable to connect with Slack. This does not affect users already connected to Slack; messages are still being sent as normal. We have contacted Slack's support team and will provide updates as they are available.