Array formula doesn't work with ErlangC formula

[uwmarkyo]

Hi I created an ErlangC formula for my excel:

{=IFERROR(SUM(IF(ROW(INDIRECT("1:"&CEILING(H2+1,1)))-1>=H2,0,IFERROR((((F2^ROW(INDIRECT("1:"&CEILING(H2+1,1))))/FACT(ROW(INDIRECT("1:"&CEILING(H2+1,1)))-1))*((H2-ROW(INDIRECT("1:"&CEILING(H2+1,1)))+1)/(F2+(H2-ROW(INDIRECT("1:"&CEILING(H2+1,1)))))),0))),0)}

at the end, I want to use Array formula to sum it up, but it won't work. can you teach me why it won't do it?
Thanks,

Day	Date	Interval	Forecast	Schedule	Calls Per Hr	AHT	Fcst Vol	Target Ans (sec)	ErlangC
Sun	4/2/2023​	8:00:00 AM​	9​	15​	20​	329​	10​	30​	{=IFERROR(SUM(IF(ROW(INDIRECT("1:"&CEILING(H2+1,1)))-1>=H2,0,IFERROR((((F2^ROW(INDIRECT("1:"&CEILING(H2+1,1))))/FACT(ROW(INDIRECT("1:"&CEILING(H2+1,1)))-1))*((H2-ROW(INDIRECT("1:"&CEILING(H2+1,1)))+1)/(F2+(H2-ROW(INDIRECT("1:"&CEILING(H2+1,1)))))),0))),0)}