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HomeDocsClaude Documentation 21 Sep 2026
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Connect an authorization server changedclaude-tag/admins/federated-access/authorization-server

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104104 
105105## Verify the connection
106106 
107[Federated connections](/docs/claude-tag/admins/federated-access/limits#where-federated-connections-work) work only in agent sessions, such as a Slack channel. A test from a personal session, such as a direct message with `@Claude`, won't work.
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107109In a channel whose workspace or channel has the bundle attached, start a new thread and ask Claude to make a small read:
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109111```text wrap theme={null}
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127129* **"That address is already connected as a gateway. Enter your authorization server's own addresses, or remove the gateway first."**: the token endpoint, or the **Issuer URL** value, is the address of a gateway connected in one of your Access bundles. Enter the server's own addresses, or delete that gateway's connection from its bundle first.
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129131For other dialog messages, see [Troubleshoot federated cloud access](/docs/claude-tag/admins/federated-access/troubleshooting).
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133If Claude reports HTTP 403 with a reason that starts with [`request blocked: this credential only works in channel sessions, not personal ones`](/docs/claude-tag/admins/federated-access/troubleshooting#request-blocked-this-credential-only-works-in-channel-sessions-not-personal-ones), the request came from a personal session, such as a direct message with `@Claude`. A personal session runs under a person's own account. [Federated connections](/docs/claude-tag/admins/federated-access/limits#where-federated-connections-work) work only in agent sessions, so test again from a new thread in a Slack channel under the [scope](/docs/claude-tag/admins/attach-to-scope#how-scopes-inherit) of the Access bundle that holds the connection.
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131135## Related resources
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