This article addresses an error that occurs when a user attempts to install a Slack application associated with a custom OAuth2 connection in Auth0. The installation fails with the following error:

You are not authorized to install -app name-, it is restricted for this workspace.

Example error:

• Slack
• OAuth2

This error occurs because the Slack workspace has a setting enabled that requires administrator approval before a user can install a new application.

This issue is related to the Slack application management configuration and must be resolved within the Slack workspace.

1. A Slack workspace administrator must disable the setting that requires approval for application installations.

2. For detailed instructions, refer to Slack's documentation: Manage app approval for your workspace.