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Claude Code login errors explained: what each sign-in message means and how to fix it

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A developer found that Claude Code shows several distinct login messages that were easy to confuse, and mapped them against version 2.1.318. "Not logged in" means no usable credential exists for the session, while "Login expired" means an attempt to renew a saved claude.ai login was refused and the login was cleared. Version 2.1.318 added a third message, "Login reached its time limit," for logins that hit a fixed end date, where renewing early does not help. Most messages are resolved by running /login inside Claude Code or claude auth login in a shell, while unattended jobs may need claude setup-token. The findings were checked by reproducing one error on Windows and by reviewing Anthropic's documentation and changelog.

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