What the official Demo patch actually fixed
The first Demo update states that the ‘session found but cannot join’ issue was fixed, joining by code was corrected, and a clear error should appear when the connection fails. That is historical Demo evidence, not proof that every current connection succeeds.
Official mediaFast checks before changing anything
- 01
Confirm the host and guest are both online in Steam and using the same Demo or full-game entry.
- 02
Compare the visible game version or restart Steam so both clients receive the current build.
- 03
Create a fresh room, generate a fresh join code and copy it without surrounding spaces.
- 04
Try the official Steam invite path to learn whether the problem is code-specific or room-wide.
- 05
Swap the host once. If the new host works, record which network or machine produced the failure.
Isolate the failure by symptom
| Symptom | What it suggests | Next safe check |
|---|---|---|
| Code is rejected immediately | Copy, expiry or room-state issue | Generate one new code and retry once |
| Session is found but entry fails | Room, version or network path | Try Steam invite and change host |
| One friend fails, others join | Guest-specific client or network | Restart Steam and verify files for that guest |
| Nobody can join the host | Host-side room or network | Use a different host before router changes |
| All players enter but state differs | Possible sync issue | Stop the shift and capture build/version details |
- 01Same buildDemo or full game→
- 02Fresh roomOne stable host→
- 03Steam inviteOfficial path→
- 04Join codeIsolate the failure
Network steps that stay proportionate
Restart the game and Steam before restarting the router.
Avoid mixing modded and unmodified clients during diagnosis.
Allow the game and Steam through the operating-system firewall only through normal application prompts or explicit app rules.
Do not disable security tools broadly or install third-party online-fix packages.
Keep the exact error text and time so an official report is useful.
What to include in a useful report
Record the build, whether Steam invite also failed, party size, host region, whether another host worked and the exact on-screen error. Remove the join code itself before posting a screenshot publicly.
Questions this page should settle
Was the join-code bug fixed?
An official June Demo update says one session-found join bug was fixed and code joining was corrected. Current failures can have other causes.
Should I open router ports first?
No. First test version parity, a fresh room, Steam invites and a different host; those checks are faster and safer.
Why can one friend not join when others can?
That pattern points toward the affected guest's client, Steam session or network path rather than a room-wide outage.
Source Check
Last checked . Facts can change after the release build unlocks.