From Unified CM 12.x, Login is unavailable(23) means the entered user ID, self-service user ID or primary extension (depending on loginType) was not found in the database.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco Unified Communications Manager
- Subsystem
- Extension Mobility
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 12.x and later
- Checked
- 2026-10-02
Sources
- CUCM 12.X Extension Mobility (EM) and Extension Mobility Cross Cluster (EMCC) Log in service URL — Cisco Systems · tier 2 current vendor documentation · Troubleshoot / error code 23
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting Extension Mobility login failures in Unified CM: source note cucm-extension-mobility-troubleshooting-err-23-id-not-found. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-extension-mobility-troubleshooting-err-23-id-not-found
BibTeX
@misc{warmtransfer-claim-cucm-extension-mobility-troubleshooting-err-23-id-not-found,
title = {Troubleshooting Extension Mobility login failures in Unified CM: source note cucm-extension-mobility-troubleshooting-err-23-id-not-found},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-extension-mobility-troubleshooting-err-23-id-not-found},
note = {Source note cucm-extension-mobility-troubleshooting-err-23-id-not-found, checked 2026-10-02}
}