The JSC looks to be configured properly, but the traceotions show "dynamic gateway match unsuccessful".
The user-at-hostname must be at least 13 characters in length.
Example of minimum requirements:
set security ike gateway Juniper-Secure-Connect dynamic user-at-hostname "[email protected]"
This value is internal only between the SRX and the JSC client for the IKE phase 1 authentication and does not have to reflect any real world domain or user.
2025-08-18 : Formatting and Title