Make a 4×4 grid

Reorder columns has 1, 4, 2, 3

Read going down from the upper left D

dqv64hulong666py

Let’s start by making pairs to see what we are working with

ac ab ac cd c8 ae aa be b1 ab aa b2 c9 c6 c9 b0 b4

Notice how where numbers should fall in the passcode format they all begin with C. Let’s try Hex Atbash

0123456789abcdef
fedcba9876543210

53 54 53 32 37 51 55 41 4e 54 55 4d 36 39 36 4f 4b

Convert hex to Ascii

STS27QUANTUM696OK