Hi @harydd_17 ,
Could you explain what the specific months mean? Was it last month?
Do you want to send an email reminder at the beginning of every month for every item due from the previous month?
If so, I did a test for your reference.
In my scenario:
My SharePoint List:



@And(less(item()?['DueDate'], utcNow('yyyy-MM-dd')),equals(formatDateTime(item()?['DueDate'], 'MM'), addDays(utcNow('yyyy-MM-dd'), -1, 'MM')))
length(body('Filter_array'))

items('Apply_to_each')['Emailaddress']
If possible, I ask you to test this flow again tomorrow, March 1st. If you want to test it today, it is recommended that you use this condition in the 'Filter_array' control.
@And(less(item()?['DueDate'], '2024-03-01'),equals(formatDateTime(item()?['DueDate'], 'MM'), addDays('2024-03-01', -1, 'MM')))
Best Regards,
Sunshine Gu