New Hire during open life is not triggering for new hire during open enrollment window

Summary:

We have open enrollment configured and running smoothly, but recently we are trying to understand a configuration done in past, where maybe a formula was modified to take care of new hires during open enrollment. But as of now, the new hires are not having a new hire during open life event assigned during the open enrollment and are trying to understand why this is happening. Can you please help.

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