I'm considering that when you ran the manual job that succeeded, perhaps you're not running it the same as a scheduled job would run.
When you run a job manually with Run
Now from the Backup Definition File List,
it runs with your
credentials. When it runs as scheduled, it runs as whatever you have set in Defaults/Schedule Settings
(many people set the switch to run as the System Account which has no network privileges, and you must supply appropriate credentials in the default data). I
f you want to duplicate what happens when it runs as scheduled, go to the Scheduled Backups tab, select a schedule entry, and right-click Run Now. If you do this, you'll have to use the ctrl-alt-m key to surface the running job output display because it will be running in a session different than your login.
If you already knew this, then my SWAG at what might be different is not helpful.
L.W. (Dan) Danz, Overland Park KS
Reflect v8.1.7847+ on Windows 11 Home 23H2 22631.3085+ | Reflect v8.1.7853+ on Windows 10 Pro 22H2 19045.3996+
Reflect v8.1.7784+ on 2 systems Windows 10 Home 22H2 19045.3803+