Unknown resource - could not find token service endpoint

Error Message

In ArcGIS Online, attempts to access a feature service using Map Viewer fail, and the following error message is returned:

Error:   
Unknown resource - could not find token service endpoint

Additionally, attempts to access the same feature service using Map Viewer Classic fail, with the error message below returned.

Error:   
The layer cannot be added to the map.

Cause

The cached version of the website stored on the local machine does not match the cached version loaded from the browser.

Solution or Workaround

On the local machine, clear the browser cache to resolve the issue. Depending on the browser used, refer to the links provided for instructions.

• For Google Chrome, refer to Google Account Help: Clear cache & cookies for more information.
• For Microsoft Edge, refer to Microsoft Support: View and delete browser history in Microsoft Edge for more information.
• For Mozilla Firefox, refer to Mozilla Support: Clear the cache for more information.
• For Safari, refer to Apple Support: Clear the history and cookies from Safari on your iPhone, iPad, or iPod touch for more information.