To make sure all can give and receive kudos, we recommend auto-adding team members to your Matter-connected Slack channel when invited to your Slack workspace.
Who can use this: Workspace Owners and Admins on every plan. Slack only. Using Microsoft Teams? See Automatically add users to Matter in Microsoft Teams.
For an overview of the whole feature, read the Matter setup and rollout guide for Slack.
Using Slack's "Default Channel" feature you can set default channels for them to automatically join when they've accepted their invite into your Slack workspace.
Only Slack Workspace Owners and Admins can set default channels for their workspace. At this time, only public channels can be added as default channels.