concatenation

On form B. I added this formula.
I'm trying to concatenate all of values in a column named Request ID (in Form a) based on the value Description (in Form to the Vendor Number (Form A)
=INDEX([{Request ID}]1 + [{Request ID}]999, MATCH(Description$9, {Vendor Number}, 0))
Form A
Request ID Vendor Number
123 A
125 B
126 A
Form B
Vendor Number: A
Return Value should be "123, 126"
Comments
-
I am not sure what the reasoning is for this portion
[{Request ID}]1 + [{Request ID}]999
So I will just use {Request ID} as the reference and assume it is the entire column. I am also assuming the {Vendor Number} range is the same size.
Try something more along the lines of this:
=JOIN(COLLECT({Request ID}, {Vendor Number}, Description$9), ", ")
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