Slack Auth Mismatch
How to recover from Slack auth mismatch problems involving tokens, scopes, workspace installs, and stale configuration.
Slack auth mismatches often happen after partial app changes, reinstall confusion, or secrets being updated in one place but not another.
What the symptom usually means
The agent may appear installed but fail when sending messages, responding to events, or validating requests from the workspace.
Most likely causes
Common causes include using the wrong token for the environment, missing scopes, stale signing secrets, or a reinstall step that was skipped after changing the app configuration.
Recommended fix order
Verify which workspace and app instance you are targeting, compare stored tokens and signing secrets against the current Slack app, reinstall if scopes changed, then rerun a minimal live test.
Work from identity and connectivity first, then provider settings, then higher-level prompt or runtime assumptions. That sequence avoids wasting time on downstream symptoms.
Get back to a working Hermes deployment faster
Hermes Host reduces the number of moving parts you have to debug at once, which makes channel, provider, and runtime issues much easier to isolate.
FAQ
Do Slack scope changes require reinstalling the app?
Usually yes. Scope changes often do not take effect for the workspace until the app is reinstalled.
What does auth mismatch usually mean?
That the runtime and the current Slack app configuration no longer agree about the credentials or scopes in use.