Some APIs require special scopes, or permissions, to access certain operations. Slack's services are heavily scoped and your Slack authentication must contain the scopes that are required for your use case. If you are missing a scope, the Slack connector will show 'missing_scope' in the drop-down menu of the input panel:
To resolve a 'missing scope' error when using the Slack connector, verify that you included all of the required scopes when setting up the Slack authentication. To learn more about Slack's scopes and permissions, click here.
A number of scopes are pre-selected for you as defaults; however, not all of the many scopes are pre-selected: