Get LastRow using "Find" only works for Col A

If I use

lRow = .Cells.Find("*", .Range("A1"), , , xlByRows, xlPrevious).Row

This gets the correct LastRow number for column A, but if I try

lRow = .Cells.Find("*", .Range("B1"), , , xlByRows, xlPrevious).Row

or any other column I get the number 1

What am I doing wrong or do not understand?

Thanks