Symptoms

Vantage API call leads to "invalid_client" error:

Cause

the API Client Secret could be expired. It should be checked via Configuration -> Public API Client by the tenant administrator:

Resolution

The Secret key should be re-created according to the guide. Check the relevant instance:

EU:

https://vantage-eu.abbyy.com/help/English/AdminGuide/?topic=admin_managingrestapiclients_createclient

US:

https://vantage-us.abbyy.com/help/English/AdminGuide/?topic=admin_managingrestapiclients_createclient

AU:

https://vantage-au.abbyy.com/help/English/AdminGuide/?topic=admin_managingrestapiclients_createclient