Unclear Which setups get the detailed message is not known, though it may be gateway sign-in.
What
A 403 error means the server refused access. When Claude Code's sign-in check fails this way in some setups, the error now includes a shortened copy of the explanation the server sent back, cut off at a set length. Before, it always showed the same fixed message.
Why
The error is more likely to say what actually went wrong with your sign-in.
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Which setups get the detailed message is not known, though it may be gateway sign-in.