3632868 - Email Notification was not sent after Task Chain finished with error.

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental." 

You have chosen option "Send email notification only when the run has completed with an error." according to SAP Help: Configure Email Notification | SAP Help Portal.
However emails are not sent after the task chain failed.

In the log of the task chain, you can find error message "Task <ID> finished at <timestamp> with status FAILED".
And the following error message can be found in the log of sub objects of the task chain:
"You have not authorized SAP to run task chains or schedule data integration tasks on your behalf. Select the option provided to give your consent."

• SAP Datasphere

KBA , DS-DI-SCH , Scheduling and Task Chains , Problem