Hi @cindy jones
As your actual need is to send emails 30, 60, 90 days before the end date, here I provide another workflow for you to refer to:
First, we need three variables:
Then I set value for these three variables and set the condition (if Today equals variables), send email.
Last we need to pay attention, I add pause action and transition to stage1 is to let this workflow run every day, so that we could check if today equals to "30days before, 60days before and 90 days before" day by day.
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