Do I need to adjust something on the dependents return?
Did your dependent file a return? Check if on their return the box is checked for Someone can claim You as a dependent or if they claimed themselves.
See this whole thread for reject code 517 and that getting a IP Pin might let you efile.https://ttlc.intuit.com/community/taxes/discussion/my-federal-got-rejected-with-reject-code-ind-517-02-so-i-amended-my-son-s-taxes-and-mark-box-saying/00/3505489