This is not an easy one to try and put some logic into it but here goes:

Start by making pairs

X6 X2 86 9X X9 92 X6 X8 96 97 92 95 X2 93 X6 96 X5 X2 X1 X5 96 97

Here is how you need to interpret each pairs: (a*10)+b

Example: 86=(8*10)+6=86

Why you should look at it this way? It will all make sense once you get to 9X

Now X is the roman numeral for 10 so:

X6=(10x10)+6=106
X2=(10x10)+2=102
86=(8*10)+6=86
9X=(9*10)+10=100
92=(9*10)+2=92
X6=(10*10)+6=106
X8=(10*10)+8=108
96=(9*10)+6=96
97=(9*10)+7=97
92=(9*10)+2=92
95=(9*10)+5=95
X2=(10x10)+2=102
93=(9*10)+3=93
X6=(10x10)+6=106
96=(9*10)+6=96
X5=(10*10)+5=105
X2=(10*10)+2=102
X1=(10*10)+1=101
X5=(10*10)+5=105
96=(9*10)+6=96
97=(9*10)+7=97

Resulting string:
106 102 86 100 92 106 108 96 97 92 95 102 93 106 96 105 102 101 105 96 97

Not really a good Decimal to Ascii string but looking at the distribution the lowest number is 86 and highest 108.
108-86=22 this could hint to a numbers to letters string. Just need to find the right number to subtract from.

Assuming that the highest number of the code would be XX it would give us (10*10)+10=110

So from 110 subtract all values above (110-106, 110-102,…) to get:
4 8 24 10 1 18 4 2 14 13 18 15 8 17 4 14 5 8 9 5 14 13

Convert numbers to letters (a=0)
EIYKBSECONSPIREOFIJFON

8ykb7conspireo5j4n

Making pairs will somewhat reveal the encode
c9 9c 90 9d cb 8f 9e 96 91 8b 94 cb 8c ca 9d

Looking at where the numbers should fall in the regular passcode format you can notice that they all start with C
In Hexadecimal values 30 to 39 convert 0 to 9 in Ascii. How can we make C=3 ?

Hexadecimal Atbash:
0123456789ABCDEF
FEDCBA9876543210

c9 9c 90 9d cb 8f 9e 96 91 8b 94 cb 8c ca 9d
36 63 6f 62 34 70 61 69 6e 74 6b 34 73 35 62

Convert Hexadecimal to Ascii
6cob4paintk4s5b

Well none of them gave something except for ROT-3 which gave
evifqwfhmhyyoanowwtyizucx

That five was actually just pure coincidence

When all else fails I usually try to brute Vigenere the string.

The way I do it is to put in TWO, THREE, FOUR and so on as the passphrase using the Vigenere Autokey cipher. This will sometime reveal a keyword to use to decode the string. In this case still nothing.

When even that fails remember to always try Vigenere Autokey with abcdefghijkl…. or simply “a” and bingo!

Vigenere Autokey with A will reveal
hruofuowtrkradnevesjcaxis

Reverse
sixacjsevendarkrtwoufourh

6acj7darkr2u4h