Okay, so it seems like it's not the first row, because there is one more <tr> element above it that's "hidden". And the column is not actually 6th, but 8th.
So, your selector should end with
tbody > tr:eq(1) > td:eq(7) > a
tr:eq(1) will target the 2nd row (indexes are 0-based) and td:eq(7) will target the 8th column.
You could also use a more appropriate parameter for targeting the correct column like this:
tbody > tr:eq(1) > td[aria-describedby="AvailableReportsResults_Format"] > a
That's because the columns do actually have properties that are unique for each column.
But you still need to target the row by using it's index.
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