[Bug] API Error: 401 on new Claude Code sessions and idle session resumption

Bug Description
New claude code sessions are getting API Error: 401, when a new claude code session is initiated,
existing session works fine, but when idle sessions are continued, they also start showing API, i am using multiple claude code sessions. Error: 401, using in tmux

Environment Info

• Platform: darwin
• Terminal: tmux
• Version: 2.1.52
• Feedback ID: ea415aac-6fe5-48b1-a31d-ff2a111d3d00

Errors

[{"error":"Error: ENOENT: no such file or directory, open '/Library/Application Support/ClaudeCode/managed-settings.json'\n    at openSync (unknown)\n    at readSync (/$bunfs/root/claude:12:1441)\n    at F2 (/$bunfs/root/claude:6412:113)\n    at AO (/$bunfs/root/claude:6414:226)\n    at GP8 (/$bunfs/root/claude:6398:5806)\n    at s90 (/$bunfs/root/claude:6398:5579)\n    at <anonymous> (/$bunfs/root/claude:6398:4272)\n    at async a90 (/$bunfs/root/claude:6398:4654)\n    at async <anonymous> (/$bunfs/root/claude:11966:400)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-24T10:05:58.016Z"},{"error":"Error\n    at pj (/$bunfs/root/claude:92:1144)\n    at <anonymous> (/$bunfs/root/claude:93:10067)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (/$bunfs/root/claude:95:2149)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-24T10:05:58.697Z"},{"error":"Error\n    at pj (/$bunfs/root/claude:92:1144)\n    at <anonymous> (/$bunfs/root/claude:93:10067)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (/$bunfs/root/claude:95:2149)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-24T10:05:59.045Z"},{"error":"Error\n    at pj (/$bunfs/root/claude:92:1144)\n    at <anonymous> (/$bunfs/root/claude:93:10067)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (/$bunfs/root/claude:95:2149)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-24T10:05:59.089Z"},{"error":"Error\n    at pj (/$bunfs/root/claude:92:1144)\n    at <anonymous> (/$bunfs/root/claude:93:10067)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (/$bunfs/root/claude:95:2149)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-24T10:05:59.124Z"},{"error":"Error\n    at pj (/$bunfs/root/claude:92:1144)\n    at <anonymous> (/$bunfs/root/claude:93:10067)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (/$bunfs/root/claude:95:2149)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-24T10:06:00.009Z"},{"error":"Error\n    at pj (/$bunfs/root/claude:92:1144)\n    at <anonymous> (/$bunfs/root/claude:93:10067)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (/$bunfs/root/claude:95:2149)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-24T10:06:00.484Z"},{"error":"Error\n    at pj (/$bunfs/root/claude:92:1144)\n    at <anonymous> (/$bunfs/root/claude:93:10067)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (/$bunfs/root/claude:95:2149)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-24T10:06:02.049Z"},{"error":"Error\n    at pj (/$bunfs/root/claude:92:1144)\n    at <anonymous> (/$bunfs/root/claude:93:10067)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (/$bunfs/root/claude:95:2149)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-24T10:06:03.260Z"},{"error":"Error\n    at pj (/$bunfs/root/claude:92:1144)\n    at <anonymous> (/$bunfs/root/claude:93:10067)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (/$bunfs/root/claude:95:2149)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-24T10:06:03.865Z"},{"error":"Error\n    at pj (/$bunfs/root/claude:92:1144)\n    at <anonymous> (/$bunfs/root/claude:93:10067)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)…

 API Error: 401 {"type":"error","error":{"type":"authentication_error","message":"OAuth token has
     expired. Please obtain a new token or refresh your existing
     token."},"request_id":"req_011CYT1KQjh3yzvrcg9ZKcyK"} · Please run /login

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