Why is GSX Pro not detecting my SimBrief ID in Microsoft Flight Simulator 2024?
GSX Pro usually fails to detect a SimBrief ID in Microsoft Flight Simulator 2024 because the wrong SimBrief identifier has been entered, GSX is not fully up to date for the current sim build, or GSX is querying an old or missing flight plan. Re-enter the correct account details, generate a fresh SimBrief plan, update GSX, and restart its background service.
Why is GSX Pro not detecting my SimBrief ID?
There are a few common causes, and most of them are simple once you know where to look. The big one is identity mismatch: GSX may be expecting your SimBrief username while you have entered the numeric user ID, or the other way round.
The other frequent causes are an outdated GSX build, a stale cached session after changing settings, or no valid SimBrief operational flight plan being available for GSX to pull. Microsoft Flight Simulator 2024 adds another layer, because add-ons that partly worked in earlier builds can fail on online lookups until they are updated.
| Symptom | Likely cause | What to do |
|---|---|---|
| GSX says the SimBrief user is not found | Wrong username or wrong numeric ID | Check both identifiers and enter the exact one GSX expects |
| GSX accepts the account but finds no briefing | No current SimBrief flight plan, or wrong account | Create a fresh plan and confirm every add-on is using the same SimBrief account |
| It worked before a sim update | GSX build no longer matches the current MSFS 2024 version | Update GSX fully, then restart the sim and GSX service |
| It only fails intermittently | Cached session, firewall, VPN or connection issue | Restart GSX/Couatl, disable VPN if used, and allow GSX online access |
| Only one aircraft fails | Aircraft profile or EFB account mismatch | Test with a default aircraft and compare settings |
The most common fix: SimBrief username vs SimBrief ID
This catches a lot of people out. Different add-ons use different SimBrief identifiers. Some want your SimBrief username, while others work with the numeric pilot ID attached to your account.
If GSX is not detecting your SimBrief details, do not assume the number is always the right entry. Check the label in GSX carefully. If it refers to a user name, enter your exact SimBrief username. If it refers to an ID, use the numeric one. Avoid extra spaces before or after the entry.
If you recently changed your SimBrief username, GSX may still be reading the old value from a previous session. In that case, re-enter the current details and restart GSX completely rather than only returning to the main menu.
How do we fix GSX Pro not detecting SimBrief in MSFS 2024?
- Update GSX Pro
Before changing anything else, make sure GSX Pro is updated to its latest available build for Microsoft Flight Simulator 2024. A surprising number of SimBrief issues are really compatibility issues after a simulator update.
- Confirm the correct SimBrief account details
Open your SimBrief account details and verify both your exact username and your numeric ID. If GSX is failing with one, try the other only if the field wording suggests that identifier is expected.
- Re-enter the identifier manually
Do not rely on an old saved value. Type it in again carefully. Watch for capitals, spaces and any copied blank characters if you pasted it from a browser.
- Create a fresh SimBrief flight plan
GSX may have no usable flight data to retrieve if your last briefing is old, incomplete or tied to a different airframe. Generate a new plan, dispatch it fully, and then return to the simulator.
- Make sure every add-on uses the same SimBrief account
If your aircraft EFB or FMC is signed into one SimBrief account and GSX is using another, the flight data will not line up. This is common on shared PCs or after reinstalling add-ons.
- Restart GSX and the simulator
Changing the ID inside a running session is not always enough. Restart the GSX background service if available, or close Microsoft Flight Simulator 2024 completely and relaunch it.
- Check firewall, antivirus and VPN settings
GSX needs to reach SimBrief online. If a firewall, security package or VPN is filtering that connection, GSX may behave as if the ID is wrong when the real problem is that it cannot complete the lookup.
- Test at a stock airport with a default aircraft
This helps separate a GSX-wide issue from an aircraft-specific one. If SimBrief works there, the fault is more likely to be tied to a particular aircraft profile, EFB setup or a conflicting add-on.
MSFS 2024-specific causes to check
Outdated GSX components after an MSFS 2024 update
MSFS 2024 can change enough under the hood that online integrations start misbehaving even when GSX still loads. If boarding, refuelling or menus appear normal but SimBrief does not, we would still treat GSX version mismatch as a prime suspect.
Old settings carried over from another installation
If you migrated from an older Microsoft Flight Simulator setup, GSX may still be holding onto old account details or stale configuration. Re-entering the SimBrief information manually is often quicker than trying to diagnose inherited settings.
Aircraft tablet or EFB mismatch
Many MSFS 2024 aircraft now integrate with SimBrief directly through their own tablet or avionics interface. If that aircraft is linked to one account and GSX to another, GSX may look broken when the issue is actually split account data.
What if GSX detects the ID but not the flight?
That is slightly different from not detecting the ID at all. In that case, your account details may be fine, but GSX cannot find a suitable current briefing.
Check for these points:
- A fresh SimBrief flight plan has been generated recently.
- The departure and arrival are set correctly.
- The aircraft type in SimBrief is sensible for the aircraft you loaded.
- You are logged into the same SimBrief account in both GSX and the aircraft, if the aircraft also uses SimBrief.
- You restarted the session after creating or changing the flight plan.
If GSX still cannot find your SimBrief details
At that stage, strip the problem back. Load a default aircraft at a default airport, use a newly generated SimBrief plan, and test again with only GSX in the workflow. That gives you a clean baseline.
If the clean test works, the original issue is probably an aircraft integration problem, a profile conflict or a stale cached setting. If it still fails in the clean test, the cause is more likely to be the SimBrief identifier entered in GSX, a connection block, or an outdated GSX install.
For broader Microsoft Flight Simulator fixes, utilities and add-on help, we keep our library organised at https://flyawaysimulation.com/downloads/.
Quick checklist
- Use the correct SimBrief identifier: username or numeric ID as required.
- Re-type it manually with no extra spaces.
- Generate a new SimBrief flight plan.
- Make sure GSX and the aircraft are using the same account.
- Update GSX Pro for the current MSFS 2024 build.
- Restart GSX/Couatl and then the simulator.
- Check firewall, antivirus and VPN interference.
- Test with a stock aircraft and stock airport.
In practice, the wrong SimBrief identifier and stale GSX sessions account for most cases. If you fix those first, you will usually get GSX talking to SimBrief again without much drama.