Symptoms
After ABAP agent configuration, the below error message appeared in the logs of /DVD/APPD_STATUS .logs:
Reason and prerequisites
The API key was not entered in the t-codeĀ /DVD/APPD_CUST.
Solution
Mandatory A mandatory step is to generate the an API key according to theĀ documentation, insert it into /DVD/APPD_CUST, and save the changes.