Thank you Jeffrey! This is most likely the cause since I can manually so a SFTP command enforcing their preferred cipher suite.

With this being said, I'm assuming there is not an option in an Ensemble production to enforce a certain type of cypher suite?

There definitely does seem to be one! I went ahead and set the parameters in the Method and changed my test system to match my production system. Thank you guys so much!

On my production box it is a 0 and on my test system it is a 2.