Hey Bernadette,
This error means Trailhead couldn't retrieve an access token for your hands-on org, not a generic connection blip. The real fix confirmed by others hitting this exact message:
1. Confirm you can log into your hands-on org directly (outside Trailhead) first
2. Go to your Trailhead account, find "Launch your hands-on org," and disconnect/unlink the org (look for an "x" next to it)
3. Reconnect it fresh (re-authenticate)
4. Try the challenge again
If disconnecting doesn't show an option, or you only have one org listed with no visible "x," try creating a completely new Trailhead Playground instead, that resets the token relationship cleanly.
If this still doesn't work after unlinking/relinking, log a case with Trailhead Support, this exact error has been reported as an ongoing token-refresh issue for some accounts that isn't user-side fixable.
Reference:
https://developer.salesforce.com/forums?id=9060G000000I1KLQA0
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