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When the server keeps rejecting this device's /keys/upload with 400 "One time key ... already exists", the device's encryption store has diverged and the SDK retries forever (matrix-rust-sdk#5200, still open). Synapse saw 474k of these from May 30 to Jul 8 2026. The fix is a fresh login, so: - keyUploadWatch observes /keys/upload responses through the client's fetchFn (the response the SDK gets is untouched; a clone is read). Three conflicts within 15 min = stuck; any successful upload clears it. - KeyUploadBanner (critical strip, same slot as the sync/clock banners): "Encryption on this device is out of sync" with Details and "Fix: sign out…", which opens the normal logout dialog (it already warns when the device isn't verified / backed up). Server side, Grafana now alerts on the same signal (E2EE Key Upload Conflicts) and on delayed-event 5xx (Call Delayed-Event Errors). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5