# Kinesis consumer failing when using InitialPosition "AT_TIMESTAMP"

I have a pipeline with a Kinesis consumer and I need to use the AT_TIMESTAMP option. After setting the InitialPosition option to AT_TIMESTAMP, setting the Initial timestamp option to 1538517600000 and starting the pipeline, it fails with the following error:

 Pipeline Status: RUNNING_ERROR: java.lang.IllegalArgumentException: Invalid InitialPosition: AT_TIMESTAMP 

Am I missing something or is it really not working properly?

If so, are there any plans to fix this feature or workaround I could try?