I searched our online knowledge base and did find this article for Encryption Credentials Have Expired. The suggestion is to download the latest driver from our drivers and downloads page which you have done already. My suggestion would be to call into the support department for additional assistance @ 1-800-821-2797.
Thanks, TammyL-Xerox Community Manager
Be sure to click Kudos for those who have helped you. Select Accept as Solution for posts that have helped to solve your issue(s)!
When trying to set up WorkCentre 7855 on a MBA with Catalina, I keep getting two error messages - if I set it up with Safe AirPrint it says "Credentials expired", and if I use regular AirPrint I get "subunit recovery failure". I have updated to the most recent driver for Catalina, and the PDFs on what OS works with what printer say that the 7855 should work on Catalina - yet, I cannot make it print. Does anyone have a workaround? It would be most appreciated. (It works just fine from numerous PCs, so I have a vague feeling it's not the printer that's the problem...)