Online ranked matches and general online functionality were permanently shut down on August 24, 2022.
Since you cannot buy it digitally anymore, avoid "free download" links that promise the full game for nothing—these are often phishing attempts or contain viruses. Instead, consider these legitimate alternatives: jump-force-free-download-v3-02
Bandai Namco officially Jump Force on February 8, 2022. Online ranked matches and general online functionality were