Please try at E4
=IF((C4="Urgent")*(D4>=H$2)*(D4<H$2+29),SUM(N(FREQUENCY(IF((C$4:C$23="Urgent")*(D$4:D$23>=$H$2)*(D$4:D$23<H$2+29)*(B$4:B$23>B4),B$4:B$23),B$4:B$23)>0))+1,"")
14 May is more than 15 Apr
I add D$4:D$23<H$2+29 to check date with in a month
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