diff --git a/machine-docs/STATUS-2.md b/machine-docs/STATUS-2.md
index 7171bb1..2144f60 100644
--- a/machine-docs/STATUS-2.md
+++ b/machine-docs/STATUS-2.md
@@ -54,10 +54,14 @@ deploy-count=1, real upgrade crossover, P4 restore `test_restore_returns_state`
 recipe-PR `recipe-maintainers/immich#1` pg_dump backup is a real fix, published-recipe bug statically
 confirmed), 2 distinct P3 functional tests, clean teardown. **P4-restore RED CLOSED, no veto.** DONE.
 
-**Q4.1 matrix-synapse — full lifecycle run IN FLIGHT @2026-05-30** (`RECIPE=matrix-synapse PR=0`,
-log `/root/ccci-matrix-full.log`). Overlay-complete (3 non-vacuous functional: federation-version +
-client-versions-JSON + register-two-users-send-receive §4.3; P4 ops seeds postgres ci_marker via the
-recipe's real pg_backup.sh DB hook). Goal: full green → claim. NOT yet claimed.
+**Q4.1 matrix-synapse — install/upgrade/backup/restore GREEN; custom §4.3 register test FAILED,
+DIAGNOSING @2026-05-30.** Full run `/root/ccci-matrix-full.log`: install+upgrade+backup+restore pass
+(deploy-count=1, P4 ci_marker survives), 2/3 functional pass (federation-version + client-versions-JSON);
+but `test_register_two_users_send_receive_message` FAILED — synapse returns **HTTP 500 M_UNKNOWN
+Internal server error** on the shared-secret admin register POST (nonce GET succeeds, so the endpoint
+is enabled). Synapse v1.149.1 (latest published). Reproducing with synapse-log capture
+(`/root/matrix-synapse-debug.log` + `/root/ccci-matrix-debug.log`) to get the traceback. NOT a test to
+weaken — diagnosing the 500 (recipe config vs synapse regression vs test). NOT claimed.
 
 **Q4.6 discourse — BLOCKED/DEFERRED @2026-05-29.** Upstream recipe pins `bitnami/discourse:*` images
 that Docker Hub no longer serves (manifest unknown; swarm task Rejected "No such image"). Image exists