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It’s likely that you’ve either misconfigured your “Client” in Learning Locker or you’re using an incorrect “Authorization” header. To correctly configure your Client and use the correct Authorization header, we recommend that you firstly follow our documentation for creating a “Store” in Learning Locker. Creating a Store no longer will automatically creates create a new client, so to create a client that’s associated to your Store and Client that is enabled with the correct scopes , click on the Create client button on the Store list item and follow the link to the Clients page (or and associated to the Store you created. Therefore, once you’ve created a Store, go to Settings > Clients) to and find the new clientClient. The new Client will have a “Basic auth” token which you can use as the value for your “Authorization” header in any HTTP requests to the xAPI (be sure to prepend “Basic “ to the start of the token).