Hi @Shaunbuckleyy1
In that case, you need to maintain the data in either a sharepoint list or a dataverse table with the patient name, phone number and the last checkup date.
You can setup a flow that runs on a recurrence and gets the data from the datasource with a filter query that would fetch all records where last checkup is greater than 729 days and send an SMS to them.
Hope this Helps!
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