40G QSFP cable in C9500-24Y4C 100G port - switch doesn't recognize

[PatrickCavell85782]

My customer is trying to connect 2 C9500-24Y4C switches together via one of the 100G ports. They are using a 3rd party version of this cable/QSFP  --> QSFP-H40G-CU1M cable. Neither switch acknowledges that anything is connected to the port (see below). No log messages either. I'm thinking it's a bad cable/QSFP but customer is having the same problem with 2 of these cables.

Any thoughts on what might be the issue?

Cisco IOS XE Software, Version 17.03.04
Cisco IOS Software [Amsterdam], Catalyst L3 Switch Software (CAT9K_IOSXE), Version 17.3.4, RELEASE SOFTWARE (fc3)

Switch#sh int hundredGigE 1/0/25
HundredGigE1/0/25 is down, line protocol is down (notconnect)
Hardware is not present
Hardware is Hundred Gigabit Ethernet, address is c44d.8451.ebf9 (bia c44d.8451.ebf9)

[Leo Laohoo]

Raise a TAC Case. 
I know there are several bugs involving Cisco-branded QSFP optics. 

3rd party QSFP are not affected by the bugs.

[Leonardo Pena Davila]

 Hello PatrickCavell85782, 

There is a bug that is hitting certain QSFP cables in that version 17.3.4. Take a look on the link below:

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwa21130 

HTH

Leonardo