memory: AAD Connect AdminSDHolder writeback-permission pattern

Reference memory + index entry: diagnosing/fixing AAD Connect "completed-export-errors"
(8344 INSUFF_ACCESS_RIGHTS) where AdminSDHolder strips the connector account's write
permission on a protected admin object. Covers msDS-KeyCredentialLink (Russo) and
msExchSafeSendersHash (Glaztech); csexport /f:x diagnosis + dsacls AdminSDHolder grant.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.claude/memory/MEMORY.md

@@ -28,6 +28,7 @@
 - [Trebesch DESKTOP-QNP3ON5 shell replacement](reference_trebesch_qnp3on5.md) — AT Trebesch box runs an Explorer shell replacement; explorer.exe owner check returns blank — use Win32_ComputerSystem.UserName. GuruRMM SWIFT-LION-2892.
 - [reference_backblaze_storage_rate](reference_backblaze_storage_rate.md) -- ACG's Backblaze B2 storage cost rate ($0.00695/GB) for the GuruRMM mspbackups storage-cost calculation
 - [Unraid VM no-IP causes](unraid-windows-vm-virtio-no-ip.md) — PRIMARY (general "new VMs stopped getting IPs lately"): Docker sets bridge-nf-call-iptables=1, so br0 VM DHCP OFFERs hit DOCKER-FORWARD (no br0 ACCEPT) and get dropped; new VMs can't complete DORA (existing renew via ESTABLISHED). Fix `=0` runtime (needs persistent post-Docker hook; not yet persisted on Jupiter). SECONDARY (Windows VM): virtio-net has no in-box driver -> use e1000 or virtio-win. Diagnose: tcpdump DHCP on pfSense; /sys vnetN rx_packets.
+- [AAD Connect msDS-KeyCredentialLink writeback](reference_aadconnect_keycredlink_writeback.md) — "completed-export-errors" + 8344 INSUFF_ACCESS_RIGHTS on a protected admin account = WHfB key writeback blocked by AdminSDHolder. Diagnose with csexport /f:x; fix with dsacls WP;msDS-KeyCredentialLink on AdminSDHolder + SDProp.
 - [reference_sqlx_migrations_immutable](reference_sqlx_migrations_immutable.md) -- NEVER edit an already-applied sqlx migration file — even a comment. sqlx::migrate! checksums each file at compile time and validates against _sqlx_migrations at startup; a changed checksum crash-loops the server with "migration N was previously applied but has been modified". Code review MUST flag any edit to an applied migration.
 
 ## Users