Metadata Injection Failure During Batch Export

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I am not sharing my private RAW files. … Export WITH Content Credentials: Fails consistently on the same 14 assets with 'Error 9 (no network access)'.​​​​​​​

That very much sounds like a bug. Unfortunately, unless Adobe can easily reproduce the problem, they’re not likely to pay much attention. So if you’re not willing to provide a sample raw that provokes the problem (along with the rest of the Export settings), the bug will likely go unfixed until someone else provides a reproducible test case.

The engine should not abort the entire file write just because a beta cloud-signature fails.

That’s the way Export is designed, so Adobe wouldn’t consider this a “bug” (under their definition of “bug”). But you could file a feature request here:

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The error message is, “Couldn’t apply Content Credentials (no network access) (9)”  Applying Content Credentials during export (via the Content Credentials section of the Export settings window) does indeed require network access to Adobe’s servers.  It’s entirely possible that during export, LR was temporarily unable to contact Adobe’s servers for some reason.

Adobe is unlikely to pay much attention unless they can straightforwardly reproduce the issue.  As first steps:

1. Provide one or more full-resolution screenshots (not phone pics) showing all the settings in the Export settings window.

2. Do the LR menu command Help > System Info and copy/paste the entire contents here so we can see exactly which versions of hardware and software LR thinks you're running and important LR options that are set.

3. If you rerun the identical export (with the same photos), does the error message occur again?  Does it happen on the same photos or different ones?  If it happens on the identical photos, then select two of them, do the menu command Metadata > Save Metadata To File, and attach the .arws and their .xmp sidecars here.  We can see if exporting them with the same exact settings produces the same error on other LR configurations.