Based on your description, I recommend that you first determine whether the schedule belongs to the "Annual" or "Every2Years".
Then we delay the operation of flow, and if it belongs to Every2Years, then flow will delay sending mail for 716 days (send an email 14 days before the review date), and then delay sending a second message for 4 days(send an email 10 days before the review date).
If it belongs to Annual, flow will delay sending the email by 351 days and then send the second email 4 days later.
For specific steps you can view the screenshot below:
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