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Fix: Can’t join lobby / join fails

Quick fixes when joining a co-op lobby fails: version mismatch, privacy, cross-play isolation tests, and network sanity checks.

TL;DR

Most “can’t join” issues come from version mismatch, privacy/invite permissions, or strict NAT / unstable networks.

Fast checks

  • Confirm both players are on the same game version
  • Restart the game + platform client
  • Ensure both accounts can receive invites (privacy / online status)

Isolation test (fastest)

  1. Try joining a same-platform lobby
  2. If same-platform works → cross-play pairing/settings issue
  3. If same-platform fails → general network/NAT issue

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