Journal Source Security - Override Period End Cutoff

I'm looking to implement Journal Source Security and have found that for a role that has access to a journal source and has the box checked for override period end cutoff, it's not letting me post the journal. When I try to post the journal I receive an error message about not being able to post as the cutoff date is passed for the journal source. Can you not post a journal using the online journal post with this feature? or is there additional setup that should be done? anyone else have this issue?

thanks!