You will need to consult your specific software's manual to add an exception/exclusion. Add the Steam directory and the Just Cause 4 directory to the exception list.
This article provides a detailed, step-by-step breakdown of why this happens and how to fix it permanently. just cause 4 unable to initialize steam api
For Rico Rodriguez, the master of wingsuits and chaos, this wasn't just a software bug; it was the ultimate weapon of the Black Hand. They hadn't used surface-to-air missiles or elite soldiers this time. No, they had deployed a "digital shroud" over Solís, a logic bomb that severed Rico's connection to the very reality that governed his universe. You will need to consult your specific software's
A privilege mismatch is extremely common. If Steam runs as a standard user and Just Cause 4 runs as an administrator, Windows blocks the API call because the game is requesting higher privileges than its parent process. For Rico Rodriguez, the master of wingsuits and
This error means the game cannot communicate with Valve’s Steam client. Without this handshake, Steam cannot verify your ownership, track achievements, or sync cloud saves. Consequently, Just Cause 4 refuses to launch.
Corrupted or missing steam_api64.dll is the #1 technical cause.