Unclear What causes this message to appear, and whether it is switched on for everyone, is not clear.
What
Claude Code now has a message for when the current session (one ongoing conversation) belongs to a different account from the one you are signed in with: "This session belongs to another account, so nothing was sent. Send a message to choose which account to use." Claude Code also now records which account owns a session.
Why
This keeps your messages from being sent under the wrong account when a session is owned by someone else's sign-in.
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What causes this message to appear, and whether it is switched on for everyone, is not clear.