Historical note: this issue was reported during a specific outage window, so if you're hitting a similar error now, treat these as general troubleshooting steps rather than confirmation of an active outage.
- Check if it's a widespread server issue first — in this case, many group members reported the same "you are not signed in / Error 403" GCKey problem around the same time, pointing to a site-wide IRCC/GCKey server issue rather than an individual account problem.
- Clear your browser cookies and cache as a first troubleshooting step, in case it's a local session issue rather than a server-side one.
- If others are reporting the same error at the same time, the most likely fix is simply to wait it out — server-side outages have historically resolved within about a day.
Bottom line: before assuming your account or new GCKey is broken, check whether others are reporting the same error — it may just be a temporary IRCC/GCKey system outage.