Code #1

Observations

Passcode format is there, go through your usual cipher routine.

Spoiler

All numbers, check your ranges

Spoiler

Let’s make pairs to see what we are working with

28 38 17 15 65 28 96 38 97 87 56 87 76 96 65 45 45 66 58

Reverse

85 66 54 54 56 69 67 78 65 78 79 83 69 82 56 51 71 83 82

Convert decimal to Ascii

UB668ECNANOSER83GSR

Reverse

RSG38RESONANCE866BU

18 letters. There enough “I” in there to spell lots of numbers

Spoiler

Make a 3×6 grid

Read going left form the upper right S

sqsnithimperfectninieizk

sqs93imperfect998zk