To check if a cross-scope privilege is preventing you from using a REST message from the global scope via script in another scope, first verify that the REST message is accessible by checking the "Accessible from" setting in the REST message record. It should allow access from all scopes. Since there are no denied records in the `sys_scope_privilege` table, also ensure that the script has the proper permissions to execute in the desired scope. You can enable debug logging for "Application Cross Scope Access" in the system logs to identify if any cross-scope access issues are happening during runtime.
