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Once Human error code 120: can't enter scenario (fix)

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IsThisGameDown

Last checked

September 23, 2026

Once Human Steam Discussions — Error Code 120 ↗

Selecting and trying to enter a new scenario (a time-limited game mode server) fails with an "error code 120" message and blocks entry.

Also appears as: once human error code 120, once human error 120, error code 120 scenario, can't enter scenario once human

Two separate Steam Discussions reports describe hitting error 120 when trying to enter a newly-selected scenario, one with several replies from other affected players. Neither thread got an official response or a confirmed fix, and the reports don't pin down whether it's a scenario sign-up cap, a server assignment glitch, or something else — so this stays reported rather than confirmed until a clearer cause surfaces.

Operational

No problems reported in the last 15 minutes.

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What to try

  1. 01

    Wait a few minutes and retry selecting the scenario

    Wait a few minutes and retry selecting the scenario — reports describe this happening around scenario sign-up/opening windows rather than as a permanent block.

    Unconfirmed
  2. 02

    Verify game files through Steam before retrying

    Verify your game files through Steam's Properties menu before retrying.

    Unconfirmed
  3. 03

    Try a different scenario server and check for a sign-up lock notice

    If one specific scenario consistently throws 120, try a different scenario server in the same region, and check oncehuman.game/news for a sign-up lock or merge notice affecting that scenario.

    Unconfirmed

Did this fix it for you?

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What people are saying

Notes from players who've hit this one — no time limit, an answer from months ago is still an answer.

  • Nothing reported here yet.
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