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2727Work through these in order. Each step says what success looks like and where to go if it fails.
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29291. **Is the Claude app installed in this workspace?** Start typing `@Claude` in any channel. **Works**: Slack autocompletes to a Claude app with an app badge; if more than one Claude app appears, check with your admin which one to use. **Fails**: nothing autocompletes, or only a person named Claude appears. The app isn't installed; this needs your admin (send them the [setup overview](/docs/claude-tag/admins/setup-overview)).
302. **Is Claude in this channel?** Type `/invite @Claude` in the channel's message box, not in a thread reply. Slack rejects `/invite` inside threads ("/invite is not supported in threads. Sorry!"). **Works**: Slack posts "Claude was added to #channel" (or "is already in this channel"). Mention it again. **Fails**: Slack says you can't add apps to this channel (a Slack Connect or guest-restricted channel); try an internal channel instead.
302. **Is Claude in this channel?** Type `/invite @Claude` in the channel's message box, not in a thread reply. Slack rejects `/invite` inside threads ("/invite is not supported in threads. Sorry!"). **Works**: Slack posts "Claude was added to #channel" (or "is already in this channel"). Mention it again. **Fails**: Slack says you can't add apps to this channel (a Slack Connect or guest-restricted channel); try an internal channel instead. If Slack says "You don't have permission to invite people to this channel", the channel or workspace limits who can add people. In Slack, open **Channel details** → **Agents & apps** (called **Integrations** in some Slack versions), select **Add**, and pick **Claude**. Or ask someone who can add people to the channel to add Claude.
31313. **Is Claude Tag turned on for this channel?** Mention it again now that it's invited. **Works**: it reacts and replies. **Fails**: it replies "Claude is disabled in this channel" (Claude Tag is turned off for the channel, its workspace, or the organization), or it replies but behaves like the earlier Claude in Slack, with no channel memory and pull requests opening under your name rather than Claude's (the channel is set to **Legacy**). Either way this needs your admin (send them [Migrate from the earlier Claude in Slack](/docs/claude-tag/admins/restrict-access#migrate-from-the-earlier-claude-in-slack)).
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3333If `@Claude` still gets no reaction and no reply after all three, send your admin [the admin entries for a silent workspace](/docs/claude-tag/admins/troubleshooting#nothing-responds). If the silence covers every channel across an Enterprise Grid, the fix needs a Slack organization admin rather than your Claude admin, so send the link to them.