Option 90 does not close session when YAUTDSC *YES

Document ID : KB000015102
Last Modified Date : 14/02/2018
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Introduction:

Option 90

Question:

Option 90 does not close session when YAUTDSC *YES why is that?

Environment:
IBM I Series
Answer:

if YAUTDSC is *YES and skeleton name YSIGNON is used it works fine