but Call interface success （SequenceDataSource.GetDataAsync（））
See this article -
https://developer.milestonesys.com/s/article/sequences-retrieval-with-the-MIP-SDK
I have the test program from the knowledge base article, it uses SequenceDataSource.GetData() and it works fine for me.
Please add some details.
What is the XProtect product and version? Version of the MIP SDK? Is this a standalone integration? Does it succeed with some cameras but fail on others?
Try
Does my test program work for you?