Count Unique From Filtered Values

Hi.

I'm trying to create a report to count the number of events based on a few conditions. This is the formula I've came up with so far:

=SUM(COUNTIFS('Sheet1'!B:B,"202201",'Sheet1'!M:M,{"This is text 1","This is text 2","This is text 3","This is text 4"}))

The formula above works well counting the total number of events but it doesn't remove the duplicates in column C.

The first condition is to select the period 202201 in column B, select unique event numbers in column C, and then match these events with the text description in column M. Each event in column C has a unique number but it comes with many different asset numbers in column F, which end up duplicating these unique event numbers in column C. In other words, I only need to count the total number of unique events of each period based on the description and without the asset numbers.

This report is pulling data from another tab in the workbook which is also importing filtered data from a different spreadsheet. The goal is to allow the team to simply update the report clicking Refresh All.

Thank you in advance.