Using the FIND below, what do I need to get the row and cell where I find the
match in column B?

With Sheets("Sheet1").Range("B:B")
Set Rng = .Find(What:="I-100421224950", _
After:=.Cells(.Cells.Count), _
LookIn:=xlValues, _
LookAt:=xlWhole, _
SearchOrder:=xlByRows, _
SearchDirection:=xlNext, _
MatchCase:=False)