Same issue here. Spent 90 minutes on the phone with an engineer Tuesday and have no resolve. We are on-prem customer and the engineer could log into his Citrix Files account from my Teams connector with no issues.
Apparently, we see only files that are hosted on the Sharefile public cloud zone. Is it in the roadmap to be able to present files in Teams coming from private Storage zones (on premise) and also from Network Shares connectors ? Thanks for your reply